ZA200206956B - Derivatives of quinoline as alpha-2 antagonists. - Google Patents

Derivatives of quinoline as alpha-2 antagonists. Download PDF

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ZA200206956B
ZA200206956B ZA200206956A ZA200206956A ZA200206956B ZA 200206956 B ZA200206956 B ZA 200206956B ZA 200206956 A ZA200206956 A ZA 200206956A ZA 200206956 A ZA200206956 A ZA 200206956A ZA 200206956 B ZA200206956 B ZA 200206956B
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alkyl
compound
alkoxy
formula
mono
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ZA200206956A
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Siegfried Wurster
Mia Engstroem
Juha-Matti Savola
Lisa Hoeglund
Jukka Sallinen
Antti Haapalinna
Andrei Tauber
Anna-Marja Hoffren
Harri Salo
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Orion Corp
Juvantia Pharma Ltd Oy
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Publication of ZA200206956B publication Critical patent/ZA200206956B/en

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Description

DERIVATIVES OF QUINOLINE AS ALPHA-2 ANTAGONISTS
FIELD OF THE INVENTION
’ The present invention relates to therapeutically active derivatives of quinoline, including the pharmaceutically acceptable salts and esters thereof, and their use as alpha-2 antagonists.
BACKGROUND
Some compounds exhibiting alpha adrenergic activity are well known in the art. Those compounds may be used for the treatment of a wide variety of diseases and conditions of the peripheric system and the central nervous system (CNS).
The alpha adrenergic receptors are divided into alpha-1 and alpha-2 adrenoceptors, each of which are further divided into subtypes. Accordingly, alpha-2 adrenoceptors in humans have been subdivided into three pharmacological subtypes known as alpha-2A, alpha-2B and alpha-2C adrenoceptors. A fourth subtype, alpha-2D, is known in rat, bovine and porcine and it corresponds to alpha-2A in man. These subtypes have a distinct distribution in human and animal tissues. For instance, alpha-2C adrenoceptors are concentrated in the CNS and they appear to play a role in the modulation of various CNS-mediated behavioural and physiological responses.
Compounds that are non-specific to any of the above-mentioned alpha-2 subtypes, and compounds that are specific to a certain alpha-2 subtypes are already known. For example, atipamezole is a non-specific alpha-2 antagonists. Atipamezole has been described in, for example, EP-A-183 492 (cf. p.13, compound XV) and A. Haapalinna et al., Naunyn-Schimiedeberg's
Arch. Pharmacol. Vol. 356, 1997, p.570-582. U.S. Patent No. 5,902,807 describes compounds that are selective antagonists for the alpha-2C subtype and may be used in the treatment of mental illnesses, e.g. mental disturbances induced by stress. Such compounds include, for example, MK-912 and BAM- 1303. Furthermore, WO-A-99 28300 discloses substituted imidazole derivatives ’ 30 having agonist-like activity for alpha-2B or 2B/2C adrenoceptors. The disclosures of all documents cited above in this paragraph are incorporated by reference herein.
As to the derivatives of quinoline, Medicinskaja parazitologija parazitarnye bolezni, vol.5, 1991, 55-7 (Mikhailitsyn F.S. et al.) and J. Med.
Chem., vol.20(8), 1977, 987-996 (Cain F.C. et al.) describe, for example, ) acridine derivatives as anticancer and/or antiparasitic agents. In addition, a publication by Adams et al in 1985 (Mol. Pharm. 27, 480-491) reports on the ’ binding of diquinolines, diacridines and a number of monoacridines on rat brain alpha-1-, alpha-2- and beta-adrenoceptors.
SUMMARY OF THE INVENTION
An object of the present invention is to provide further antagonists of alpha-2 adrenoceptors that can be used for the treatment of diseases or conditions of the pheripheric or central nervous system where alpha-2 antagonists are indicated to be useful. Accordingly, an object of the present invention is to provide further compounds to be used as alpha-2 antagonist agents in the treatment of mammals, including humans and animals.
Another object of the present invention is to provide further compounds useful as selective alpha-2C antagonist agents for the treatment of various disorders or conditions of the central nervous system where alpha-2C antagonists are indicated to be useful.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows the effects of atipamezole and compound 1 on dexmedetomidine-induced hypolocomotion.
Figure 2 shows the effects of atipamezole and compound 1 in a forced swimming test in Balb/c mice.
DETAILED DESCRIPTION OF THE INVENTION
‘ One embodiment of the present invention covers compounds of formula
I:
NR,R, ) ay “ NR,
Xx Ra = (Rm N Rb wherein,
R4 is H or (C1-Cg)alkyl, each Ro is independently OH, halogen, (C1-Cg)alkyl, (Co-Cg)alkenyl, (C4-Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C1-Cg)alkyl-S- or hydroxy(C1-Cg)alkyl;
A is a benzene ring or (C5-C7)cycloalkyl; when A is a benzene ring each Rg is independently OH, halogen, (C1-
Cg)alkyl, (Co-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C4-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkylcarbamoyl, (C1-Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NHo-CO-; when A is (Cgs-C7)cycloalkyl each R3 is independently OH, halogen, (C4-Cg)alkyl, (C4-Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-
Ceg)alkyl,
R4 and Rg form, together with the N-atom to which they are attached, /\ —N X _/ wherein X is O or =NRg; Rg is H, OH, NH2, (C1-Cg)alkyl, (Co-
Cg)alkenyl, CN-(C1-Cg)alkyl, (C4-Cg)alkoxy-CO-(C1-Cg)alkyl, (C1-Cg)alkyl-
CO-, NH2-CO-, mono- or di(C1-Cg)alkylcarbamoyl, hydroxy(C1-Cg)alkyl, (C3-
Cg)cycloalkyl, phenyl, naphthyl or benzyl, wherein the said phenyl, naphthyl or . benzyl is optionally substitued with one to three substituent(s) each independently being OH, halogen, NO», NH», (C1-Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C1-Cg)altkylamino or halo-(C1-Cg)alkyl; or R4 and Rg form, together with the N-atom to which they are attached, / (CH )n
TN
(Re)r wherein n = 1 or 2; Rg is as defined above; and r = 0 to 3; or Rg and Rg form, together with the N-atom to which they are attached, 1-imidazoly!, 1-imidazolinyl or 1-triazolyl, each of which can optionally be substituted with one to three substituent(s) R7 each independently being (C4- Ceg)alkyl or NHo; or one of Rg and Rg is -SO2Rg and the other of R4 and Rg is H or (C1-
Cg)alkyl; Rg is (C1-Cg)alkyl, phenyl, naphthyl or benzyl, wherein the said phenyl, naphthyl or benzyl is optionally substituted with one to three substituent(s) Rg each independently being OH, halogen, NO2, NH», (C1-
Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C4-Cg)alkylamino;
Ra and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (C2-
Cg)alkenyl, (C2-Cg)alkynyl, (C1-Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C1-Cg)alkyl-S- or CN; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring optionally substituted with one to ' three substituent(s) R'3 each independently being OH, halogen, (C1-Cg)alkyl, (Co-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C4-Cg)alkyl, NO2, NH2, mono- or di(C1- . Cg)alkylamino, (C4-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkyicarbamoyl, (C1-
Cg)alkyl-S-, hydroxy(C 1-Cg)alkyl or NH2-CO-;
or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally } substituted with one to four substituent(s) R1g each independently being OH, halogen, (C1-Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C1-Cg)alkylamino or . 5 hydroxy(C1-Cg)alkyl; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed bicyclo[2.2.1]-heptane ring optionally substituted with one to four substituent(s) each independently being OH, halogen, (C1- Cg)alkyl or (C4-Cg)alkoxy; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five or six membered heterocyclic ring with one ring heteroatom =NR14, which heterocyclic ring is optionally substituted with one to three substituent(s) R1g as defined above; R44 is Hor (C1-Cg)alkyl, or R11 is phenyl! optionally substituted with one to three substituents R42 each independently being OH, halogen, NO2, NHo, (C4-Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C1-Cg)alkylamino; mis 0 to 3; and tis 0to 3, or pharmaceutically acceptable salts and esters thereof.
The compounds of formula | can be used for the manufacture of a medicament for the treatment of diseases or conditions where alpha-2 antagonists are indicated to be effective.
The following subgroups (1) to (18) of compounds of formula | taken alone or in any combination with each other are possible: : 30 (1) A is a benzene ring; (2) Ais a (C5-C7)cycloalkyl; (3) Ra and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (C2-
Cg)alkenyl, (Co-Cg)alkynyl, (C1-Cg)alkoxy, halo(C4-Cg)alkyl, NO2,
NH2, mono- or di(C1-Cg)alkylamino, (C1-Cg)alkyl-S- or CN; e.g. H,
halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, (Co-Cg)alkynyl, (C4-
Cg alkoxy or halo(C1-Cg)alkyl; such as H, halogen, (C1-Cg)alkyl or . (C1-Cg)alkoxy; e.g. H or (C4-Cgz)alkyl, wherein the said (C1-C3)alkyl includes both straight and branched chain radicals of up to 3 carbon - 5 atoms; (4) Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring unsubstituted or substituted with one to three, e.g one or two, such as one, substituent(s) R'3 each independently being OH, halogen, (C1-Cg)alkyl, (Co-
Cg)alkenyl, (C4-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C1-Cg)alkyl-CO-, NH2-CO-, mono- or di(C1-
Cg )alkylcarbamoyl, (Cq-Cg)alkyl-S or hydroxy(C1-Cg)alkyl; e.g. OH, halogen, (C4-Cg)alkyl, (C2-Cg)alkenyl or (C1-Cg)alkoxy; such as halogen, (C1-Cg)alkyl or (C1-Cg)alkoxy; e.g. (C1-Cg)alkyl or (Cq-
Cg )alkoxy; (5) Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to four, e.g. one or two, such as one, substituent(s) Rg each independently being OH, halogen, (C1-
Cg)alky! (C1-Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C4-Cg)alky!; such as (C41-Cg)alkyl or (C1-Cg)alkoxy; e.g. (C1-Cg)alkyl; (6) Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed bicyclo[2.2.1]-heptane ring optionally substituted with one to four, e.g. one or two, such as one, substituent(s) each independently being OH, halogen, (C4-Cg)alkyl or (C4-Cg)alkoxy; e.g. (C1-Cg)alkyl (7) Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five or six membered heterocyclic ring with one ring heteroatom =NR44, which heterocyclic ring is optionally substituted with one to three, e.g. one or two, such as one substituent(s) Rg as defined above; and R{1 is H or (C1-Cg)alkyl, or
R11 is phenyl optionally substituted with one to three, e.g. one or two, such as one, substituents R12 each independently being OH,
halogen, NO2, NH, (C4-Cg)alkyl, (C4-Cg)alkoxy or mono- or di(C1-
Cg)alkylamino; : (8) R4 and Rg form, together with the N-atom, 1-piperazinyl which is 4- substituted with Rg, wherein Rg is as defined above; e.g. (C1- “ 5 Cg)alkyl, (C2-Cg)alkenyl, CN-(C1-Cg)alkyl, (C1-Cg)alkoxy-CO-(C1-
Cg)alkyl, (C1-Cg)alkyl-CO-, NH2-CO-, mono- or di(C14-
Cg)alkylcarbamoyl, hydroxy(C4-Cg)alkyl, (C3-Cg)cycloalkyl or optionally substituted benzyl; such as (C4-Cg)alkyl, (C2-Cg)alkenyl, hydroxy(C1-Cg)alkyl, (C3-Cg)cycloalkyl; e.g. (C1-Cg)alkyl; (9) R4 and Rj form, together with the N-atom, a morpholino ring; (10) Ry and Rg form, together with the N-atom, a 1-piperidinyl or 1- pyrrolidinyl optionally substituted with Rg, wherein Rg is as defined above, possibly (C4-Cg)alkyl, (Co-Cg)alkenyl, CN-(C4-Cg)alkyl, (C1-
Cg)alkoxy-CO-(C4-Cg)alkyl, (C1-Cg)alkyl-CO-, NHo-CO-, mono- or di(C4-Cg)alkylcarbamoyl, hydroxy(C1-Cg)alkyl or (C3-Cg)cycloalkyl; such as (C1-Cg)alkyl, (Co-Cg)alkenyl, hydroxy(C1-Cg)alkyl, (C3-
Cg)cycloalkyl; e.g. (C1-Cg)alkyl; (11) Rg4 and Rg form, together with the N-atom, 1-imidazolyl, 1- imidazoliny! or 1-triazolyl, each of which can optionally be substituted with one to three, e.g. one or two, such as one, substituent(s) Ry each independently being (C1-Cg)alkyl or NH2; e.g. R4 and Rg form, together with the N-atom, 2-amino-imidazol-1-yl or 2-amino- imidazolin-1-yl; (12) one of R4 and Rg is -SO2Rg and the other of R4 and Rg is H or (C1-Cg)alkyl; Rg is independently (C1-Cg)alkyl, phenyl, naphthyl and benzyl, wherein the said phenyl, naphthyl or benzyl is optionally substituted with one to three, e.g. one or two, such as one, substituent(s) Rg each independently being OH, halogen, NO2, NH, (C1-Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C4-Cg)alkylamino; (13) mis0to 3;e.g.0,1or 2; e.g. Oor 1; such as 0; (14) tis0to3;e.g.0,1o0r2;e.g. 0or1; suchas 0; and/or (15) RqisH;
(16) R4q is (C1-Cpalkyl (17) Rg is independently OH, halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, ' (C1-Cg)alkoxy, halo(C4-Cg)alkyl, NO2, NH2, mono- or di(C1-
Cg)alkylamino, (C1-Cg)alkyl-S- or hydroxy(C1-Cg)alkyl; such as OH, : 5 halogen, (C1-Cg)alkyl, (C1-Cg)alkoxy or hydroxy(C1-Cg)alkyl; e.g. (Cq-Cg)alkyl or (C4-Cg)alkoxy; and/or (18) R33 is independently OH, halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH», mono- or di(C1-
Cg)alkylamino, (C4-Cg)alkyl-CO-, mono- or di{C1-Cg)- alkylcarbamoyl, (C1-Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NH2-CO-; such as OH, halogen, (C4-Cg)alkyl, (C2-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl; e.g. halogen, (C1-Cg)alkyl or (C1-Cg)alkoxy.
A possible subgroup of the compound of formula | is a compound of formula IA:
NR,R,
B
NR, x IA (CHI ~ . (R,)m N (Ry) wherein R4, Ro, R3, Rg, R5, R10; mand t are as defined above; iis 1 to 3; and jis Oto 4.
Another possible subgroup of the compound of formula | is a compound of formula 1B:
NR,R,
Con
NR,
IB
Ra ~ (R,)m N Rb wherein A, R14, Rp, R3, Rg, Rs, Ra, Rb, m and t are as defined above; and Ra and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (C2-
Cg)alkenyl, (Co-Cg)alkynyl, (C4-Cg)alkoxy, halo(C4-Ce)alkyl, NO2, NHp, mono- or di(C1-Cg)alkylamino, (C1-Cg)alkyl-S- or CN; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to three substituent(s) Rqg ; each independently being OH, halogen, (C4-Cg)alkyl, (C1-
Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-Cg)alkyl.
Another possible subgroup of the compound of formula | is a compound of formula IC:
R,R; af
NR, aoc Rall © (CH,)i pa (Rehm No Ri wherein R1, R2, R3, R4, Rs, R10. R11, m and t are as defined above; i is1or2;andjis Oto 3. . Another possible subgroup of the compound of formula t is a compound of formula ID:
NR,R, a9
NR, D
XX
~ (R,)m N (Rp wherein R4, R2, R3, R'3, Rg, Rs, mand t are as defined above and p is 0 to 3; for example wherein mis 1 and R3 is (C1-Cg)alkoxy.
In a possible subgroup of the compound of formula |, IA, IB, IC or ID, Rg and Rg form, together with the N-atom to which they are attached, /\ —N X _/ wherein X is =NRg; Rg is as defined above under formula I; such as (C1-
Cg)alkyl, (C2-Cg)alkenyl, hydroxy(C4-Cg)alkyl or (C3-Cg)cycloalky! ; e.g. (C1-
Cg)alkyl.
Another embodiment of the invention provides new compounds of formula Il: ’ NR,R; ~ (Rt
NR; I x Ra = (R,)m N Rb wherein,
R4 is H or (C4-Cg)alkyl; each Ro is independently OH, halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, (Cq-
Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C1- Cg)alkyl-S- or hydroxy(C4-Cg)alkyl;
A is a benzene ring or (C5-C7)cycloalkyl, when A is a benzene ring each R3 is independently OH, halogen, (C1-
Cg)alkyl, (Co-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH2, mono- or di(C1-Cg)alkylamino, (C1-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkylcarbamoyl, (C4-Cg)alkyl-S-, hydroxy(C4-Cg)alkyl or NH2-CO-; when A is (C5-C7)cycloalkyl each R3 is independently OH, halogen, (Cq-
Cgalkyl, (C1-Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-Cg)alkyl;
R4 and Rs form, together with the N-atom to which they are attached, —N X __/ wherein X is O or =NRg; Rg is H, OH, NH2, (C1-Cg)alkyl, (C2-Cg)alkenyl,
CN-(C1-Cg)alkyl, (C4-Cg)alkoxy-CO-(C4-Cg)alkyl, (C4-Cp)alkyl-CO-, NH2-CO-,
mono- or di(C4-Cg)alkylcarbamoyl, hydroxy(C4-Cg)alkyl, (C3-Cg)cycloalkyl or benzyl, wherein the said benzyl is optionally substitued with one to three . substituent(s) each independently being OH, halogen, NO2, NH», (C1-Cg)alkyl, (C1-Cg)alkoxy, mono- or di{C4-Cg)alkylamino or halo-(C4-Cg)alkyl; or R4 and Rg form, together with the N-atom to which they are attached, / (CH, )Nn
TN
(Re)r wherein n = 1 or 2; Rg is as defined above; and r= 0 to 3; or R4 and Rg form, together with the N-atom to which they are attached, 1- imidazolyl, 1-imidazolinyl or 1-triazolyl, each of which can optionally be substituted with one to three substituent(s) Ry each independently being (C1-
Ceg)alkyl or NH2;
Ra and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (Co-
Cg)alkenyl, (Co-Cg)alkynyl, (C4-Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH, mono- or di(C1-Cg)alkylamino, (C1-Cg)alkyl-S- or CN; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring optionally substituted with one to three substituent(s) R'3 each independently being OH, halogen, (C1-Cg)alkyl, (C2-
Cg alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH2, mono- or di(C1-
Cg)alkylamino, (C4-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkylcarbamoyl, (C4-
Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NH2-CO-; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to four substituent(s) R4g each independently being OH, halogen, (C1-Cg)alkyl, (C4-Cg)alkoxy, mono- or di(C4-Cg)alkylamino or hydroxy(C1-Cg)alkyl; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed bicyclo[2.2.1]-heptane ring optionally substituted with one to four substituent(s) each independently being OH, halogen, (C4-Cg)alkyl or (C1-Cg)alkoxy; or Ra and Rb form, together with the carbon ring atoms to which they are ] 5 attached, a condensed five or six membered heterocyclic ring with one ring heteroatom =NR 1, which heterocyclic ring is optionally substituted with one to three substituent(s) Rqg as defined above; R11 is H or (C1-Cg)alkyl, or R11 is phenyl optionally substituted with one to three substituents R42 each independently being OH, halogen, NO, NH», (C1-Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C1-Cg)alkylamino; mis 0 to 3; and tis Oto 3, or of a pharmaceutically acceptable salt or ester thereof, with the provisos, that a) when Ais a benzene ring, mis O or 1, tis 0, Rq is H, R3 is Cl or NO», and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring, and X is NRg, then Rg is not H, —-CH3, -
CHoCH3, -COCHa3, or -CO-NH2; b) when A is a benzene ring, then Ra and Rb are not at the same time H; c) when A is a benzene ring, mis 1, tis 0, Rq is H, and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring, which is optionally substituted with Br, and X is O, then R3 is not
NO or -OCHg3; d) when A is a benzene ring, mis 0, tis 0, R4 is H, and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed nonsubstituted benzene ring, then X is not O; e) the compound is not 4-[4-[(7-Chloro-2-methyl-4-quinolinyl)amino]phenyi}- 1-diethylcarbamoyipiperazine, 4-[4-[(6-Chloro-2-methoxy-9- acridinyl)amino]phenyl]-1-diethylcarbamoylpiperazine, 6-amino-4-[[3-chloro-4- (1H-imidazoi-1-yl)phenyl}amino]-7-metoxy-3-quinolinecarbonitrile or 4-[[3- chloro-4-(1H-imidazol-1-yl)phenyljJamino]-7-methoxy-6-nitro-3- quinolinecarbonitrile.
A possible subgroup of the compound of formula Il is a compound of formula IIA,
NR4Rs 3.
NR,
Xn HA (CH,)i = . (Ry)m N (Rio wherein R4, Ro, R3, R4, R5, R19, m and t are as defined in formula If; iis 1 to 3; and jis 0 to 4; for example wherein iis 2, jis 0 or 1 and Rqq is (C1-C3)alkyl, wherein the (C1-C3)alkyl includes both straight and branched chain radicals of up to 3 carbon atoms; or wherein mis 0 or 1 and Rg is (C1-C3)alkyl or halogen, wherein the (Cq-
Cjy)alkyl includes both straight and branched chain radicals of up to 3 carbon atoms; or wherein the compound is [4-(4-Methylpiperazin-1-yl)phenyl}-(1,2,3,4- tetrahydroacridin-9-yl)amine, 2-{4-[4-(1,2,3,4-Tetrahydroacridin-9- yl)Jaminophenyl]piperazin-1-yl}ethanol, [4-(4-Methylpiperazin-1-yl)phenyl]-(2- methyl-1,2,3,4-tetrahydro-acridin-9-yl)amine, (8-Fluoro-1,2,3,4- tetrahydroacridin-9-y!)-[4-(4-methylpiperazin-1-yl)phenyljamine, [4-(4-
Methylpiperazin-1-yl)phenyl]-(2,7-dimethyl-1,2,3 4-tetrahydroacridin-9-yl)amine, [4-(4-Methyipiperazin-1-yl)phenyl}-(7,8,9,10-tetrahydro-6 H- cyclohepta[b]quinolin-11-yl)amine or [4-(4-Methylpiperazin-1-yl)phenyl}-(1,1,3,3- - tetramethyl-1,2,3,4-tetrahydroacridin-9-yl)amine. : 25 Another possible subgroup of the compound of formula Il is a compound of formula 1B,
NR,R; ‘ NR, 1B
SN Ra = (R,)m N Rb wherein A, Rq, Ro, R3, Rg, Rg, m and t are as defined in formula Il; and
Ra and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (C2-
Cg)alkenyl, (Co-Cg)alkynyl, (C4-Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NHo, mono- or di(C1-Cg)alkylamino, (C1-Cg)alkyl-S- or CN; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to three substituent(s) R10; each independently being OH, halogen, (C1-Cg)alkyl, (C1- Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C4-Cg)alkyl; for example wherein A is a benzene ring; or wherein mis O or 1; or wherein R3 is (C1-Cg)alkyl or (C1-Cg)alkoxy; or wherein Ra and Rb are independently H or (C1-C3)alkyl, wherein the (C1-
C3)alkyl includes both straight and branched chain radicals of up to 3 carbon atoms; or wherein A is a six membered carbocyclic ring and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring, wherein the carbocyclic ring can optionally be substituted with one to three substituent(s) each independently ’ being OH, halogen, (C1-Cg)alkyl, (C1-Cg)alkoxy or hydroxy(C1-Cg)alkyl; or wherein the compound is (3-Ethyl-2,8-dimethylquinolin-4-yl)-[4-(4- methylpiperizin-1-yl)phenyl]amine, (2-Methylquinolin-4-yl)-[4-(4- methylpiperazin-1-yl)phenyllamine, (3-Ethyl-2,6-dimethylquinolin-4-yl)-[4-(4- methylpiperazin-1-yl)phenyllamine, (3-Ethyl-6-methoxy-2-methylquinolin-4-yl)- [4-(4-methylpiperazin-1-yl)phenyllamine, (3-Ethyl-2-methyiquinolin-4-yl)-[4-(4- methylpiperazin-1-yl)phenyllamine, 4-[4-(4-Methylpiperazin-1- yl)phenylamino]quinoline-3-carbonitrile, 3-1sopropyl-2-methylquinolin-4-yi)-[4-(4- methylpiperazin-1-yl)phenyllamine, (2,3-Dimethylquinolin-4-yl)-[4-(4- methylpiperazin-1-yl)phenyllamine, [4-(4-Methylpiperazin-1-yl)phenyl}— (1,2.3,4,5,6,7,8-octahydroacridin-9-yl)amine or (3-Ethyl-2-methyiquinolin-4-yl)- methyl-[4-(4-methylpiperazin-1-yl)phenyllamine.
Another possible subgroup of the compound of formula Il is a compound of formula IIC,
NR,R; 3.
NR,
Ri
XN or fe: i — vd 2 (R,)m N
Ri wherein R4, Rp, R3, Rg, R5, R10, R11, m and t are as defined in formula ll; iis1or2;andjis Oto 3.
Another possible subgroup of the compound of formula 1 is a compound of formula IID,
NR,R. : a . NR, HD ~ ~ (R,)m N (R'y)p wherein R14, Ro, R3, R'3, R4,Rg, m and t are as defined in formula Il; and p is 0 to 3; for example wherein mis 1 and Rg is (C1-Cg)alkoxy; or wherein the compound is 2-{4-{4-(Acridin-9-yl)aminophenylipiperazin-1-yl}- ethanol, (4-Methoxyacridin-9-yl)-[4-(4-methylpiperazin-1-yl}-phenyllamine,
Acridin-9-yl-[4-(piperidin-1-yl)phenyl]Jamine, Acridin-9-yl-[4-(4-benzylpiperazin-1- yl)phenyllamine, Acridin-9-yl-[4-(4-methylpiperidin-1-yl)phenyllamine, Acridin-9- yl-[4-(3-hydroxymethylpiperidin-1-yl)-phenyljamine, Acridin-9-yl-{4-pyrrolidin-1- yhphenyllamine, Acridin-9-yl-[4-(4-cyclopropylpiperazin-1-yl)phenyljamine,
Acridin-9-yl-[4-(4-isopropylpiperazine-1-yl)phenylJamine, (Acridin-9-yl)-methyl- [4-(4-methylpiperazin-1-yl)phenyllamine or Acridin-9-yl-[2,5-diethoxy-4- (morpholin-4-yl)phenyljamine.
In a possible subgroup of the compound of Formula ii, HA, 1IB, IC, or iD,
R4 and Rg form, together with the N-atom to which they are attached, /\ —N NR, __/ wherein Rg is (C1-Cg)alkyl, (C1-Cg)alkenyl, (C3-Cg)cycloalky! or hydroxy(C14-Cg)alkyl, for example, Rg is (C4-Cg)alkyl.
The compounds of formulae | and If and the subgroups IA, IB, IC, ID,
IIA, IIB, IIC, and IID thereof, as well as the pharmaceutically acceptable esters and salts thereof, are referred to below as the compounds of the invention, unless otherwise indicated. } The compounds of the invention may have chiral carbon atom(s) in their structure. The invention includes within its scope all the possible stereoisomers of the compounds, including geometric isomers, e.g. Z and E isomers (cis and trans isomers), and optical isomers, e.g. diastereomers and enantiomers.
Furthermore, the invention includes in its scope both the individual isomers and any mixtures thereof, e.g. racemic mixtures. The individual isomers may be obtained using the corresponding isomeric forms of the starting material or they may be separated after the preparation of the end compound according to conventional separation methods. For the separation of, for example, optical isomers, e.g. enantiomers, from the mixture thereof the conventional resolution methods, e.g. fractional crystallisation, may be used.
Physiologically acceptable salts, e.g. acid addition salts with both organic and inorganic acids are well known in the field of pharmaceuticals. Non-limiting examples of these salts include chlorides, bromides, sulfates, nitrates, phosphates, sulfonates, formates, tartrates, maleates, citrates, benzoates, salicylates and ascorbates. Pharmaceutically acceptable esters, when applicable, may be prepared by known methods using pharmaceutically acceptable acids that are conventional in the field of pharmaceuticals and that retain the pharmacological properties of the free form. Non-limiting examples of those esters include esters of aliphatic or aromatic alcohols, e.g. lower alkyl esters, e.g. methyl, ethyl and propyl esters.
Terms employed herein have the following meanings: A halogen or halo refers to fluorine, chlorine, bromine or iodine, e.g. fluorine or chlorine. The term (C4-Cg)alkyl as employed herein as such or as part of another group includes both straight, and branched chain radicals of up to 6 carbon atoms, for example of 1 to 4 carbon atoms, e.g. methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyt or s- butyl. The term (C4-Cg)alkoxy as such or as part of another group refers to -O- (Cq-Cg)alkyl, wherein (C1-Cg)alkyl is as defined above. The term (C2-
Cg)alkenyl includes both straight and branched chain radicals of up to 6 carbon atoms, for example of 2 to 4 carbon atoms, containing (a) double bond(s). The term (Co-Cg)alkynyl includes both straight and branched chain radicals of up to 6 carbon atoms, for example of 2 to 4 carbon atoms, containing (a) triple bond(s). The term halo-(C1-Cg)alky! refers to (C1-Cg)alkyl radical, as defined above, that is substituted by one or more halo radicals as defined above, for example trifluoromethyl, difluoromethyl etc. The term mono-or di(C1-
Cg )alkylcarbamoyl refers to a carbamoyl radical which is N-substituted with one or two (C1-Cg)alkyl radical(s), as defined above.
The compounds of the invention can be prepared analogously or according to a variety of synthetic routes known in the literature using suitable starting materials, for example, according to or analogous to methods described by B.F. Cain et al. in J.Med.Chem., vol.20(8), 1977, pp. 987-996, and by W.A. Denny et al. in J.Med.Chem., vol.25, 1982, p.276-315, the contents of which are hereby incorporated by reference.
In general, the compounds of the invention can be prepared e.g. analogously or according to the following reaction scheme 1:
Scheme 1
Tr NR,R;
NR,R
Cl - 435 RN a x (R)t (R,)m mC TT" + OF ~
N Rb N Rb
NHR, ni \Y, I wherein Ra, Rb, R4, Ro, R3, R4, Rs, m and t are as defined above.
The above reaction is a conventional acid-catalyzed coupling of the chloro-compound of formula lll with a substituted aromatic amine of formula IV.
The reaction is carried out at room or elevated temperature in a suitable : 20 solvent, e.g. alcohol, such as methanol, in acidic conditions, to obtain the compound of formula I' which is then isolated from the reaction mixture in a . usual manner.
The starting compounds Ill and IV are commercially available or can be prepared according to or analogously to the methods described in the literature
(see e.g. J.Med.Chem., vol.20(8), 1977, pp. 987-996, and J. Med.Chem., wl.25, 1982, p.276-315, as mentioned above). : Accordingly, a substituted aromatic NR4-amine IV can e.g. be prepared starting from the corresponding nitro compound which is reduced with a red ucing : 5 agent, e.g. in the presence of SnClp-H2O, in a suitable solvent, e.g. DMF, and optionally alkylated with R4 in a manner known in the art, when Rq = (C{_g)alkyl is desired.
The starting material lll can be prepared e.g. according to following scheme 2:
Scheme 2 0 Cl
R.)m (Rm (Rs Ra : Ra soc, = me ~
N™ “Rp DMF N™ “Rb
V li wherein Ra, Rb, R3, and m are as defined above. in scheme 2 a compound V is reacted e.g. with thionyl chloride in the presence of a small amount of DMF, to obtain the 9-chlorinated reactant ll.
The reaction is carried out at room or elevated temperature.
It is obvious for a skilled person that, in the above reactions, any starting material or intermediate can be protected, if necessary, in a manner well known in the chemical field. Any protected functionality can subsequently be deprotected in a manner known in the art.
The above disclosed synthetic routes are meant to illustrate the preparation of the compounds of the invention and the preparation is by no means limited thereto, i.e. other synthetic methods that are within the general . knowledge of a skilled person are also possible.
The compounds of the invention may be converted, if desired, into their pharmaceutically acceptable salt or ester form using methods well known in the art.
The following examples are meant only for illustrating purposes and does not limit the scope of the invention defined in claims. : EXAMPLE 1
Acridin-9-yl-[4-(4-methylpiperazin-1-yi)-phenylJamine
Step 1 1.04 g (5.0 mmol) of N-(4-nitrophenyl)piperazine was dissolved in 5m of dimethylformamide. Sodium hydride (0.24 g, 6.0 mmol) was added to the reaction mixture in three portions under nitrogen atmosphere and cooling over a period of 10 min. After 30 min of stirring, 0.31 m! (6.0 mmol) of methyl iodide was added dropwise to the reaction mixture at 0 °C. Stirring was continued for 1 h at room temperature, the reaction mixture was then evaporated to dryness, and purified by silica gel chromatography (methylene chloride : methanol : triethylamine 94 : 5 : 1) to yield 1.0 g (90 %) of 1-methyl-4-(4- nitrophenyl)piperazine.
Step 2 0.999 g (4.5 mmol) of 1-methyl-4-(4-nitrophenyl)piperazine, 10.15 g (45 mmol) of tin(ll)chloride dihydrate and 20 ml of dimethylformamide were mixed and stirred overnight at 80 °C. Most of dimethylformamide was evaporated under vacuum. The remaining slurry was poured into ice water, neutralized with a sodium bicarbonate (sat.) solution, and filtered. The filtrate was extracted several times with ethylacetate and chloroform to provide 0.636 g (74 %) of 4- (4-methylpiperazin-1-yl)aniline.
Step 3 0.488 g (2.5 mmol) of 9-(10H)acridone, 2.5 ml of thionyl chloride and a catalytic amount (a few drops) of dimethylformamide were mixed at 80 °C. After min of stirring, the reaction mixture was evaporated, the residue was dissolved in chloroform and poured into cold aqueous ammonia. The ammonia solution was extracted several times with chloroform. The combined organic 30 phases were washed with 2M ammonia solution, dried over sodium sulfate and evaporated to obtain 0.517 g (97 %) of 9-chloroacridine.
Step 4 0.191 g (1.0 mmol) of 4-(4-methylpiperazin-1-yl)aniline, 2.5 ml of ) methanol and a few drops of concentrated hydrochloric acid were mixed and heated under reflux. The 9-chloroacridine (1-1,5 equivalents) and 2.5 ml methanol were mixed separately and added to the reaction mixture in small portions. After 30 min of stirring, two drops of concentrated hydrochloric acid were added, and heating was continued for 2 h. The reaction mixture was then evaporated to dryness and purified by chromatography (silica gel column; gradient from 100 % methylene chloride to 90 % methylene chloride and 10 % methanol; when 4-(4-methylpiperazin-1-yl)aniline eluted from the column, the eluent was changed to methylene chloride : methanol : triethylamine 94 : 5 : 1).
A final amount of 0.126 g (34 %, overall yield 12 %) of the title compound in pure form was obtained. "H NMR (DMS O-dg, 500 MHz): 8.05 (2H, m), 7.73 (2H, m), 7.66 (2H, m), 7.13 (2H, m), 6.97 (4H, m), 3.35 (4H, m), 2.98 (4H, m), 2.58 (3H, s); MS (EI'): 368 (M")
EXAMPLE 2
Acridin-9-yl-[2,5-diethoxy-4-(morpholin-4-yl)phenylJamine
Following the procedure outlined in Step 4 of Example 1, but substituting 2,5-diethoxy-4-morpholinoaniline dihydrochloride for 4-(4-methylpiperazin-1- yhaniline, afforded the title compound with an overall yield of 23 %. 'H NMR (CDCl;, 500 MHz): 8.19 (2H, m), 8.13 (2H, m), 7.56 (1H, s), 7.42 (2H, m), 7.04 (2H, m), 6.42 (1H, s), 3.91 (4H, m), 3.15 (4H, m), 3,10 (4H, q,J=7.27 Hz), 1.41 (6H, t, J = 7.27 Hz); MS (ESI TOF): 444 (M") ’ EXAMPLE 3 . Acridin-9-yl-[4-(morpholin-4-yl)phenyl]amine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-(morpholin-1-yl)aniline for 4-(4-methylpiperazin-1-yl)aniline, afforded the title compound with an overall yield of 64 %.
'H NMR (CDCl, 500 MHz): 7.99 (4H, m), 7.55 (2H, m), 7.17 (2H, m), 7.04 (2H, m), 6.88 (2H, m), 3.88 (4H, m), 3.15 (4H, m); MS (ESI” TOF): 356 ] (M")
EXAMPLE 4 (3-Ethyl-2,8-dimethylquinolin-4-yl)-[4-(4-methylpiperazin-1- yl)phenyljamine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-chloro-2,8-dimethyl-3-ethylquinoline for 9-chloroacridine, afforded the title compound with 27 % overall yield. 'H NMR (CDCls, 500 MHz): 7.60 (1H, m), 7.41 (1H, m), 7.16 (1H, m), 6.79 (2H, m), 6.62 (2H, m), 5.62 (1H, s), 3.12 (4H, m), 2.79 (3H, s), 2.79 (2H, q,
J = 7.63 Hz), 2.78 (3H, s), 2.59 (4H, m), 2.36 (3H, s), 1.15 (3H, t, J = 7.63 Hz);
MS (ESI* TOF): 375 (M")
EXAMPLE 5 (2-Methylquinolin-4-yl)-[4-(4-methylpiperazin-1 -yl)phenyljlamine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-chloro-2-methylquinoline for 9-chioroacridine, afforded the title compound with 24 % overall yield. '"H NMR (CDCl3, 500 MHz): 8.02 (1H, m), 7.91 (1H, m), 7.64 (1H, m), 7.44 (1H, m), 7.23 (2H, m), 7.00 (2H, m), 6.59 (1H, m), 3.26 (4H, m), 2.61 (4H, m), 2.55 (3H, s), 2.38 (3H, s); MS (ESI TOF): 333 (M") } 25 EXAMPLE 6 , [4-(4-Methylpiperazin-1-yl)phenyl]-(quinolin-4-yljamine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-chloroquinoline for 9-chloroacridine, afforded the title compound with 11 % overall yield.
'"H NMR (CDCl, 500 MHz): 8.28 (1H, m), 8.25 (1H, m), 8.06 (1H, m|, 7.66 (1H, m), 7.50 (1H, m), 7.25 (2H, m), 6.97 (2H, m), 3.25 (4H, m), 2.64 (4H, . m), 2.40 (3H, s); MS (ESI” TOF): 319 (M")
EXAMPLE 7 (3-Ethyl-2,6-dimethylquinolin-4-yl)-[4-(4-methylpiperazin-1- yl)phenyllamine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-chloro-1,6-dimethyl-3-ethylquinoiine for 9-chloroacridine, afforded the title compound with 18 % overall yield. 'H NMR (CDCla, 500 MHz): 7.90 (1H, m), 7.49 (1H, m), 7.40 (1H, m), 6.81 (2H, m), 6.67 (2H, m), 3.12 (4H, m), 2.77 (2H, q, J = 7.56 Hz), 2.78 (3H, s), 2.58 (4H, m), 2.36 (3H, s), 2.35 (3H, s), 1.15 (3H, t, J = 7.56 Hz); MS (ESI”
TOF): 375 (M")
EXAMPLE 8 (3-Ethyl-6-methoxy-2-methylquinolin-4-yl)-[4-(4-methylpiperazin-1- yl)phenyllamine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-chloro-3-ethyl-6-methoxy-2-methylquinoline for 9-chloroacridine, afforded the tittle compound with 5 % overall yield.
MS (ESI* TOF): 391 (M")
EXAMPLE 9 (3-Ethyl-2-methylquinolin-4-yl)-[4-(4-methylpiperazin-1- . yl)phenyl]lamine
Following the procedure outlined in Step 4 of Example 1, but substituting 4-chloro-3-ethyl-2-methyiquinoline for 9-chloroacridine, afforded the title compound with 17 % overall yield.
'H NMR (CDCl3, 500 MHz): 7.91 (1H, m), 7.72 (1H, m), 7.55 (1H, m), 7.25 (1H, m), 6.80 (2H, m), 6.67 (2H, m), 5.72 (1H, s), 3.11 (4H, m), 2.79 (2H, } q, J = 7.59 Hz), 2.77 (3H, s), 2.57 (4H, m), 2.34 (3H, s), 1.17 (3H, t, J = 7.59
Hz); MS (ESI" TOF): 361 (M) ‘ 5
EXAMPLE 10 (4-Methoxyacridin-9-yl)-[4-(4-methylpiperazin-1-yl)phenyl]lamine
Following the procedure outlined in Step 3 of Example 1, but substituting 9-hydroxy-4-methoxyacridine for 9-(10H)acridone, afforded 9-chloro-4- methoxyacridine, which was reacted with 4-(4-methylpiperazin-1-yl)aniline (according to the Step 4 in the procedure of Example 1) to obtain the title compound with 24 % overall yield.
MS (ESI” TOF): 399 (M")
EXAMPLE 11 [4-(4-Methylpiperazin-1-yl)phenyl]-(1,2,3,4-tetrahydroacridin-9- yl)amine
Following the procedure outlined in Step 3 of Example 1, but substituting 1,2,3,4-tetrahydro-9-(10H)acridone for 9-(10H)acridone, afforded 9-chloro- 1.2.3.4-tetrahydroacridine, which was reacted with 4-(4-methylpiperazin-1- yhaniline (according to Step 4 in the procedure of Example 1) to obtain the title compound with 46 % overall yield. "H NMR (CDCl, 500 MHz): 7.96 (1H, m), 7.72 (1H, m), 7.56 (1H, m), 7.27 (1H, m), 6.83 (2H, m), 6.73 (2H, m), 5.82 (1H, s), 3.14 (6H, m), 2.67 (2H, m), 2.58 (4H, m), 2.35 (3H, s), 1.94 (2H, m), 1.84 (2H, m); MS (ESI" TOF): 373 (M7)
EXAMPLE 12
Acridin-9-yl-[4-(piperidin-1-yl)phenyljJamine 0.202 g (1.0 mmol) of 1-bromo-4-nitrobenzene and 0.20 ml of piperidine : (2.0 mmol) were dissolved in 3 ml of dimethylsulfoxide. 0.207 g (1.5 mmol) of potassium carbonate was added and the reaction mixture was heated to 100°C. After 2 h 100 ml of water was added, and the mixture was extracted a few times with dichloromethane. The combined organic layers were dried over sodium sulfate and evaporated to obtain crude 4-(piperidin-1-yl)-1- nitrobenzene. Following the procedure outlined in Step 2 of Example 1, but substituting 4-piperidin-1-yi-1-nitrobenzene for 1-methyl-4-(4- nitrophenyl)piperazine, afforded 4-piperidin-1-ylaniline, which was reacted with 9-chloroacridine (according to Step 4 in the procedure of Example 1) to obtain the title compound with 6 % overall yield. '"H NMR (CDCls, 500 MHz): 8.05 (2H, m), 8.00 (2H, m), 7.48 (2H, m), 7.09 (4H, m), 6.86 (2H, m), 3.13 (4H, m), 1.71 (4H, m), 1.58 (2H, m); MS (ESI”
TOF): 354 (M")
EXAMPLE 13
Acridin-9-yl-[4-(4-methylpiperidin-1-yl)phenyl]lamine
Following the procedure of Example 12, but substituting 4- methylpiperidine for piperidine, afforded the title compound with 6 % overall yield.
MS (ESI" TOF): 368 (M")
EXAMPLE 14
Acridin-9-yl-[4-(3-hydroxymethylpiperidin-1-yl)phenyl]lamine
Following the procedure of Example 12, but substituting 3- hydroxymethylpiperidine for piperidine, afforded the title compound with 3 % overall yield.
"H NMR (CDCl3, 500 MHz): 7.93 (2H, m), 7.81 (2H, m), 7.47 (2H, m), 7.04 (4H, m), 6.92 (2H, m), 3.68 (2H, m), 3.59 (2H, m), 2.78 (1H, m), 2.61 (1H, } m), 1.95 (1H, br s), 1.83 (2H, m), 1.72 (1H, m), 1.23 (2H, m); MS (ESI TOF): 384 (M")
EXAMPLE 15
Acridin-9-yl-[4-(pyrrolidin-1-yl)phenyllamine
Following the procedure of Example 12, but substituting pyrrolidine for piperidine, afforded the title compound with 50 % overall yield.
MH NMR (CDCl, 500 MHz): 8.00 (4H, m), 7.56 (2H, m), 7.18 (2H, m), 7.00 (2H, m), 6.50 (2H, m), 3.27 (4H, m), 2.02 (4H, m); MS (ESI" TOF): 340 (M")
EXAMPLE 16
Acridin-9-yl-[4-(piperazine-1-yl)phenyl]amine
Following the procedure outlined in Step 2 of Example 1, but substituting
N-(4-nitrophenyl)piperazine for 1-methyl-4-(4-nitrophenyl)piperazine, afforded 4-(piperazin-1-yl)aniline, which was reacted with 9-chloroacridine (according to
Step 4 in the procedure of Example 1) to obtain the title compound with 16 % overall yield. "H NMR (CD;0D, 500 MHz): 8.21 (2H, m), 7.94 (4H, m), 7.42 (2H, m), 7.38 (2H, m), 7.20 (2H, m), 3.56 (4H, m), 3.43 (4H, m); MS (ESI" TOF): 355 (M")
EXAMPLE 17
Acridin-9-yl-[4-(4-acetylpiperazine-1-yl)phenyljlamine mg (0.10 mmol) of 9-[4-(piperazin-1-yl)phenyljaminoacridine (Example 16) was dissolved in 2 mi of chloroform, 7.1 pl (0.10 mmol) of acetyl chloride and catalytical amounts of pyridine and triethylamine were added. After
2 h of stirring at room temperature, the solvents were removed under vacuum, and the residue was purified by silica gel chromatography (eluent chloroform : methanol 6:1). The fractions with the title compound were combined, evaporated, taken up to water and extracted with chloroform. After drying over sodium sulfate, the organic layer was evaporated to obtain the title compound (6 %, overall yield 1 %).
MS (ESI" TOF): 397 (M")
EXAMPLE 18 “10 Acridin-9-yl-[4-(4-benzylpiperazine-1-yl)phenyllamine
Following the procedure outlined in Step 1 of Example 1, but substituting 9-[4-(piperazin-1-yl)phenyl]laminoacridine (Example 16) for N-(4- nitrophenyl)piperazine, and benzyl bromide for methyl iodide, afforded the title compound (15 %, overall yield 2 %). 'H NMR (CDCls, 500 MHz): 8.00 (4H, m), 7.48 (2H, m), 7.34 (4H, m), 7.28 (1H, m), 7.12 (4H, m), 6.88 (2H, m), 3.59 (2H, s), 3.21 (4H, m), 2.63 (4H, m); MS (ESI" TOF): 445 (M")
EXAMPLE 19
Acridin-9-yl-[4-(4-isopropylpiperazine-1-yl)phenyl]amine
Following the procedure outlined in Step 1 of Example 1, but substituting 9-[4-(piperazin-1-yl)phenyllaminoacridine (Example 16) for N-(4- nitrophenyl)piperazine, and isopropyl iodide for methyl iodide, afforded the title compound (11 %, overall yield 2 %).
MS (ESI” TOF): 397 (M™)
EXAMPLE 20 2-{4-[4-(1,2,3,4-Tetrahydroacridin-3-yl)aminophenyl]piperazin-1- yl}ethanol : 0.14 ml (2.0 mmol) of 2-bromoethanol and 0.17 ml (2.4 mmol) of acetyl chloride were dissolved in 2 ml of dichloromethane. 0.28 ml (2.0 mmol) of triethylamine was added, and the reaction mixture was stirred at room temperature. After 1 h 50 ml of dichloromethane was added to the reaction mixture, which was then washed with a sodium bicarbonate (sat.) solution, a 10 % citric acid solution and water. The organic phase was dried over sodium sulfate and evaporated to obtain 0.241 g (72 %) of 2-bromoethylacetate.
Following the procedure outlined in Step 1 of Example 1, but substituting 2- bromoethylacetate for methyl iodide, afforded 2-[4-(4-nitrophenyl)piperazin-1- yllethylacetate (64 %), which was reduced according to the procedure of Step 2 in Example 1 to give the corresponding amine 2-[4-(4-aminophenyl)piperazin-1- yllethylacetate in quantitative yield. 2-[4-(4-aminophenyl)piperazin-1- yllethylacetate was reacted with 9-chloro-1,2,3,4-tetrahydroacridine (according to the procedure of Step 4 in Example 1) to obtain 2-{4-[4-amino-(1,2,3,4- tetrahydroacridin-9-yl)phenyllpiperazin-1-yl}ethyl acetate with 47 % yield.
Treating the ester with 4 equivalents of lithium hydroxide in a dioxane /water solution overnight, afforded the title compound with 60 % yield (overall yield 20 %).
MS (ESI* TOF): 403 (M")
EXAMPLE 21 2-{4-[4-(Acridin-9-yl)Jaminophenyl]piperazin-1-yl}ethanol
Following the procedure outlined in Step 1 of Example 1, but substituting 9-[4-(piperazin-1-yl)phenyllaminoacridine (Example 16) for N-(4- nitrophenyl)piperazine, and 2-bromoethyl-acetate for methyl iodide, afforded 2- {4-[4-amino-(1,2,3 4-tetrahydroacridin-9-yl)phenyl]piperazin-1 -yl}ethyl acetate (31 %). Treating the ester with 8 equivalents of lithium hydroxide in dioxane /water solution overnight, afforded the title compound with 37 % yield (overall yield 2 %).
MS (ESI" TOF): 399 (M")
EXAMPLE 22
Acridin-9-yl-[4-(4-cyclopropylpiperazine-1-yl)phenyljamine 35 mg (0.10 mmol) of 9-[4-(piperazin-1-yl)phenyllaminoacridine : (Example 16) was dissolved in 1 ml of methanol. 57pl (1.0 mmol) of acetic acid, 22ul (0.11 mmol) of (1-ethoxycyclopropyloxy)-trimethylsilane and a small amount of 3 A molecular sieves were added. The reaction mixture was stirred at room temperature under nitrogen atmosphere. After 30 min 28 mg (0.45 mmo!) of sodium cyanoborohydride was added and the reaction mixture was heated at 50°C over night. The solvents were removed under vacuum, andthe residue was purified by chromatography (silica gel column, eluent chloroform/methanol 6:1) to obtain 3.8 mg (10 %, overall yield 2 %) of the ttle compound.
MS (ESI® TOF): 395 (M")
EXAMPLE 23 4-[4-(4-Methylpiperazin-1-yl)phenylaminolquinoline-3-carbonitrile 0.91 ml (10 mmol) of aniline and 1.69 g (10 mmol of ethyl(ethoxymethylene)cyanoacetate were dissolved in 10 ml of pyridine and heated under reflux. After 3 h pyridine was removed under vacuum, and the residue was purified by chromatography (silica gel column, eluent 1 % methanol in dichloromethane). 1.08 g (50 %) of ethyl(anilinomethylene)cyanoacetate were obtained. The compound was cyclized by heating in a biphenyl/phenyl ether mixture. After cooling a precipitate was filtered and washed with diethyl ether to give 4- hydroxyquinoline-3-carbonitrile (49 %). Following the procedure outlined in Step 3 of Example 1, but substituting 4-hydroxyquinoline-3-carbonitrile for 9- (10H)acridone, 4-chloro-3-cyanoquinoline (90 %) was obtained, which was reacted with 4-(4-methyipiperazin-1-yl)aniline (according to the procedure of
Step 4 in Example 1), to afford the title compound with 12 % yield (overall yield 3%). '"H NMR (CDCl, 500 MHz): 8.66 (1H, s), 8.01 (1H, m), 7.78 (1H, m), 7.73 (1H, m), 7.42 (1H, m), 7.15 (2H, m), 6.94 (2H, m), 3.29 (4H, m), 2.63 (4H, m), 2.39 (3H, s); MS (ESI" TOF): 344 (M™)
EXAMPLE 24 (3-Isopropyl-2-methylquinolin-4-yl)-{4-(4-methylpiperazin-1- yl)phenyllamine 4.56 ml (50 mmol) of aniline and 10.7 ml (60 mmol) of ethyl 2- isopropylacetoacetate were mixed with 50 ml of chloroform. 0.48 g (2.5 mmol) of para-toluenesulfonic acid was added, and the reaction mixture was refluxed with continuous removal of the water produced in the reaction. After 2 d chloroform was removed in vacuum, and the residue was refluxed in 10 ml of phenyl ether. After cooling, the precipitate was filtered and washed with diethyl ether to give 4-hydroxy-3-isopropyl-2-methylquinoline (21 %). Following the procedure of Step 3 in Example 1, but substituting 4-hydroxy-3-isopropyl-2- methyliquinoline for 9-(10H)acridone, 4-chioro-3-isopropyl-2-methylquinoline (100 %) was obtained, which was reacted with 4-(4-methylpiperazin-1- yhaniline (following the procedure of Step 4 in Example 1), to afford the titie compound with 61 % yield (overall yield 13 %). '"H NMR (CDCl3, 500 MHz): 7.95 (1H, m), 7.73 (1H, m), 7.54 (1H, m), 7.24 (1H, m), 6.79 (2H, m), 6.60 (2H, m), 5.72 (1H, s), 3.61 (1H, q, J = 7.28), 3.11 (4H, m), 2.81 (3H, s), 2.57 (4H, m), 2.34 (3H, s), 1.38 (6H, d, J = 7.28),
MS (ESI* TOF): 375 (M")
EXAMPLE 25 (2,3-Dimethylquinolin-4-yl)-[4-(4-methylpiperazin-1-yl)phenyljamine
Following the procedure of Example 24, but substituting ethyl 2- methylacetoacetate for ethyl 2-isopropylacetoacetate, afforded the title compound with 11 % yield. 'H NMR (CDCl3, 500 MHz): 8.02 (1H, m), 7.78 (1H, m), 7.59 (1H, m), 7.33 (1H, m), 6.83 (2H, m), 6.69 (2H, m), 5.90 (1H, s), 3.13 (4H, m), 2.73 (3H, s), 2.58 (4H, m), 2.35 (3H, s), 2.24 (3H, s); MS (ESI" TOF): 347 (M")
EXAMPLE 26 [4-(4-Methylpiperazin-1-yl)phenyl}-(2-methyl-1,2,3,4-tetrahydro- acridin-9-yl)amine . 1.37 g (10 mmol) of 2-aminobenzoic acid and 1.23 mi (10 mmol) of 4- methylcyclohexanone were dissolved in 10 ml of phosphorus oxychloride and the reaction mixture was heated under reflux in a nitrogen atmosphere. After 3 h most of the phosphorus oxychloride was removed under vacuum. The remaining brown syrup was poured into a cold sodium bicarbonate (sat.) solution and washed once with chloroform. The yellow precipitate forming in the basic water solution was filtered (2-methyl-1,2,3,4-tetrahydro-9-(10H)-acridone, 46 %). Following the procedure of Step 3 in Example 1, but substituting 2- methyl-1,2,3 4-tetrahydro-9-(10H)acridone for 9-(10H)acridone, gave 9-chloro- 2-methyl-1,2,3,4-tetrahydroacridine (40 %), which was reacted with 4-(4- methylpiperazin-1-yl)aniline (according to the procedure of Step 4 in Example 1), to afford the title compound with 39 % yield (overall yield 7 %). '"H NMR (CDCl, 500 MHz): 7.97 (1H, m), 7.70 (1H, m), 7.55 (1H, m), 7.24 (1H, m), 6.83 (2H, m), 6.72 (2H, m), 5.81 (1H, br s), 3.23 (1H, m), 3.14 (5H, m), 2.86 (1H, m), 2.57 (4H, m), 2.35 (3H, s), 2.24 (1H, m), 2.03 (1H, m), 1.93 (1H, m), 1.57 (1H, m), 1.10 (3H, d); MS (ESI" TOF): 387 (M")
EXAMPLE 27 [4-(4-methylpiperazin-1-yl)phenyl]-(7,8,9,10-tetrahydro-6 H- cyclohepta[b]quinolin-11-yl)amine
Following the procedure of Example 26, but substituting cycloheptanone for 4-methylcyclo-hexanone, afforded the title compound (0,2 %). (ESI® TOF): 387 (M")
EXAMPLE 28 [4-(4-Methylpiperazin-1-yl)phenyl]-(2,7 -dimethyl-1,2,3 4-tetrahydro- ’ acridin-9-yl)amine : Following the procedure of Example 26, but substituting 2-amino-5- methylbenzoic acid for 2-aminobenzoic acid, afforded the title compound (4 %). '"H NMR (CDCls, 500 MHz): 8.10 (1H, m), 7.43 (2H, m), 6.85 (2H, m), 6.83 (2H, m), 6.27 (1H, br s), 3.37 (1H, m), 3.18 (4H, m), 2.78 (1H, m), 2.61 (4H, m), 2.37 (3H, s), 2.33 (3H, s), 2.18 (1H, m), 2.02 (1H, m), 1.91 (1H, m), 1.52 (1H, m), 1.09 (1H, m), 1.10 (3H, d); MS (ESI" TOF): 401 (M")
EXAMPLE 29 (8-Fluoro-1,2,3,4-tetrahydroacridin-9-yl)-[4-(4-methylpiperazin-1- yl)phenyllamine
Following the procedure of Example 26, but substituting 2-amino-6- fluorobenzoic acid for 2-aminobenzoic acid, and cyclohexanone for 4- methylcyclohexanone, afforded the title compound (3 %). 'H NMR (CDCls, 500 MHz): 7.89 (1H, m), 7.51 (1H, m), 7.05 (1H, m), 6.87 (2H, m), 6.82 (2H, m), 3.22 (4H, m), 3.14 (2H, m), 2.66 (4H, m), 2.41 (3H, s), 2.34 (2H, m), 1.88 (2H, m), 1.67 (2H, m); MS (ESI TOF): 391 (M")
EXAMPLE 30 [4-(4-Methylpiperazin-1-yl)phenyl]-(1,1,3,3-tetramethyl-1,2,3,4- tetrahydroacridin-9-yl)amine 1.49 ml (10 mmol) of ethyl 2-aminobenzoate and 1.73 m! (10 mmol) of 3,3,5,5-tetramethyl-cyclohexanone were mixed with 20 ml of toluene. 20 mg (0.1 mmol) of para-toluenesulfonic acid was added, and the reaction mixture was refluxed with continuous removal of the water produced in the reaction.
After 9 h, toluene was removed under vacuum, and the residue was refluxed in 10 ml of phenyl ether. After cooling, the precipitate was filtered and washed with diethyl ether to obtain 1,1,3,3-tetramethyl-1,2,3,4-tetrahydro-9(10H)-
acridone (18 %). Following the procedure of Step 3 in Example 1, but substituting 1,1,3,3-tetramethyl-1,2,3,4-tetrahydro-9(10H)acridone for 9- (10H)acridone, gave 9-chloro-1,1,3,3-tetramethyl-1,2,3,4-tetrahydroacridine (21 %), which was reacted with 4-(4-methylpiperazin-1-yl)aniline (according to the procedure of Step 4 in Example 1), to afford the title compound (3 %, overall yield 0,1 %).
MS (ESI” TOF): 429 (M")
EXAMPLE 31 (1,4-Methano-1,2,3,4-tetrahydroacridin-9-yl)-[4-(4-methylpiperazin-1- yl)phenyl]amine
Following the procedure of Example 30, but substituting norcamphore for 3,3,5,5-tetramethyl-cyclohexanone, afforded the title compound (overall yield 1 %). "H NMR (CDCls, 500 MHz): 7.99 (1H, m), 7.84 (1H, m), 7.58 (1H, m), 7.38 (1H, m), 7.02 (2H, m), 6.91 (2H, m), 6.13 (1H, s), 3.44 (1H, m), 3.21 (4H, m), 3.00 (1H, m), 2.61 (4H, m), 2.37 (3H, s), 1.97 (1H, m), 1.77 (2H, m), 1.48 (2H, m), 1.26 (1H, m); MS (ESI* TOF): 385 (M")
EXAMPLE 32 [4-(4-Methylpiperazin-1-yl)phenyl]-(1,2,3,4,5,6,7,8-octahydroacridin- 9-yl)amine
Following the procedure of Example 30, but substituting ethyl 2-amino-1- cyclohexene-1-carboxylate for ethyl 2-aminobenzoate, and cyclohexanone for 3,3,5,5-tetramethylcyclo-hexanone, afforded the title compound (overall yield . 0.2 %).
MS (ESI® TOF): 377 (M")
EXAMPLE 33 (3-Ethyl-2-methylquinolin-4-yl)-methyl-[4-(4-methylpiperazin-1- : yl)phenyllamine
Following the procedure of Step 1 in Example 1, but substituting (3-ethyl- 2-methylquinolin-4-yl)-[4-(4-methylpiperazin-1-yl)phenyllamine (Example 9) for
N-(4-nitrophenyl)piperazine, afforded the title compound (overall yield 12 %). '"H NMR (CDCl3, 500 MHz): 8.03 (1H, m), 7.58 (2H, m), 7.34 (1H, m), 6.81 (2H, m), 6.42 (2H, m), 3.33 (3H, s), 3.07 (4H, m), 2.80 (3H, s), 2.71 (2H, q,
J = 7.50Hz), 2.57 (4H, m), 2.34 (3H, s), 1.12 (3H, t, J = 7.50 Hz); MS (ESI”
TOF): 375 (M")
EXAMPLE 34
Acridin-9-yl-methyl-[4-(4-(methylpiperazin-1-yl)phenyl]amine
Following the procedure of Step 1 in Example 1, but substituting acridin- 9-yl-[4-(4-methyl-piperazin-1-yl)-phenyl]-amine (Example 1) for N-(4- nitrophenyl)piperazine, afforded the title compound (overall yield 9 %). 'H NMR (CD30D, 500 MHz): 7.8 (2H, br s), 7.54 (2H, m), 7.48 (2H, m), 6.98 (4H, m), 6.79 (2H, m), 3.77 (3H, s), 3.18 (4H, m), 2.65 (4H, m), 2.36 (3H, s); MS (EI'): 383 (M")
The compounds of the invention show interesting pharmacological properties, namely, they exhibit antagonistic affinity for alpha-2 adrenoceptors.
This activity is demonstrated in the pharmacological tests presented below.
EXPERIMENT I: Binding affinity
The affinity of test compounds for the three human alpha-2-adrenoceptor subtypes (alpha-2A, alpha-2B and alpha-2C) was determined in binding competition assays with 3H-rauwolscine. The biological material consisted of membranes from Shionogi S115 cells stably transfected with one of the three human alpha-2 subtypes (A. Marjamaki et al., Biochem. Biophys. Acta, vol.1134, 1992, p.169). The membrane suspension (about 10 ug total protein } per sample) and 1 nM of 3H-rauwolscine (specific activity 75-85 Ci/mmol) were incubated with a minimum of six concentrations of the test compound in a total volume of 90 pl (50 mM KHoPOy, pH 7.5, at room temperature). Non-specific binding was defined by 100 uM oxymetazoline and corresponded to 4-10 % of the total binding. After 30 min at room temperature, the incubation was terminated by rapid filtration (TomTec 96 harvester) through presoaked GF/B glass-fiber mats (Wallac Oy) and three washes with ice-cold 50 mM KHoPO4 (pH 7.5, at room temperature). After drying, a solid scintillate (Meltilex; Wallac
Oy) was melted on filter mats, and the radioactivity was measured (BetaPlate;
Wallac Oy). The analysis of the experiments was carried out by non-linear least square curve fitting. ICs( 's were converted to Ki's by using the equation of
Cheng-Prussoff (Ki=1Cso/ (1+ [*H-ligand] / Kg, 3r1igana)). The Ki values for Compound 1 obtained in a minimum of three independent experiments were: alpha-2A Adrenoceptor: 3150 + 50 nM alpha-2B Adrenoceptor: 1470 + 130 nM alpha-2C Adrenoceptor: 28+2 nM
EXPERIMENT Il: Antagonist activity
Antagonist activity was determined as the ability of compounds to competetively inhibit epinephrine-stimulated 39S-GTPyS binding to G proteins (J.R. Jasper et al., Biochem. Pharmacol., vol.55, 1998, p.1035) in membranes of CHO cells stably transfected with one of the three human alpha-2 subtypes (K. Pohjanoksa et al., Eur. J. Pharmacol, vol.335, 1997, p.53). Membranes (5- 10 pg of protein per sample) and 12 concentrations of test compound were preincubated for 30 min at room temperature in 50 mM Tris, 5 mM MgCl2, 150 mM NaCl, 1 mM DTT, 1 mM EDTA, 10 uM GDP, 30 uM ascorbic acid, pH 7 4, with a fixed concentration of epinephrine (5 uM for alpha-2A, 15 uM for alpha- 2B, 5 uM for alpha-2C). Then trace amounts of 35S-GTPyS (0.08 nM- 0.15 nM, specific activity 1250 Ci/mmol) were added to the incubation mixture. After an additional 30 min at room temperature, the incubation was terminated by rapid vacuum filtration through glass fiber filter. Filters were washed three times with ml ice cold wash buffer (20 mM Tris, 5 mM MgCl, 1 mM EDTA, pH 7.4, at room temperature), dried and counted for radioactivity in a scintillation counter. . Analysis of experiments was carried out by nonlinear least square fitting.
Experiments were repeated at least three times. The Kg values of Compound 1 . 5 were found to correspond to: alpha-2A Adrenoceptor: 1495 + 270 nM alpha-2B Adrenoceptor: 2175 + 345 nM alpha-2C Adrenoceptor: 16+6 nM
EXPERIMENT lll: Antagonism of dexmedetomidine —induced locomotor inhibition by atipamezole but not by Compound 1; demonstration of in vivo alpha2C selectivity of Compound 1
Dexmedetomidine and atipamezole are very potent and specific alpha-2 adrenoceptor agonists and antagonists, respectively, which lack alpha-2 subtype selectivity (H. Scheinin et al., European Journal of Pharmacology,
Molecular Section, vol.151(1), 1988, p.35-42). The alpha-2 agonist —induced sedation is known to be an alpha-2A —mediated phenomenon that can be antagonised by alpha-2 antagonists (J. Sallinen et al., Mol. Pharmacol. Vol.51, 1997, p.36-46, and A. Haapalinna et al., Naunyn-Schimiedeberg's Arch.
Pharmacol. Vol.356, 1997, p.570-582). The sedative effect of alpha-2 agonists in mice is measured by the inhibition on locomotor activity. Therefore, we compared the ability of Compound 1 and atipamezole to antagonise the dexmedetomidine —induced locomotor inhibition to evaluate the in vivo alpha- 2A adrenoceptor antagonism (and alpha-2C selectivity) of these compounds.
Spontaneous locomotor activity of a total of 76 male NMRI mice (B&K,
Sweden) was measured by placing individual animals into a polypropylene animal cage (38 x 22 x 15 cm). The cages were surrounded with an infrared ’ photobeam frame system designed for activity measurements (Photobeam
Activity System PAS, Cage Rack, San Diego Instruments, San Diego, CA, ’ 30 USA). The animals were injected with various doses of either Compound 1 or atipamezole 20 min before injection of dexmedetomidine (50 nmol/kg s.c.).
Spontaneous locomotor activity was measured 20 min after dexmedetomidine injection.
The results presented in figure 1 show that atipamezole inhibited dexmedetomidine —induced sedation with doses 0.3 and 1.0 umol/kg s.c. (p < 0.01) as was expected. In contrast, Compound 1 did not antagonise the alpha- 2-agonist —induced sedation at all, demonstrating the lack of alpha-2A antagonism and the alpha-2C selectivity of Compound 1 in vivo.
EXPERIMENT IV: Stress-protective effect of Compound 1 in the mouse forced swimming test
Exposure of a test animal to an intense stressful stimulus has been observed to propagate a state of behavioural despair. This can be observed for example employing the forced swimming test, in which a rat or mouse is put into a water-filled cylinder. After a vigorous period of attempts to escape animals adopt an immobile floating posture; the extent of the immobile period is monitored and can be reduced by antidepressants and stress-protective agents. Transgenic mice that lack functional alpha-2C adrenoceptor tolerated swim-stress better than their similarly treated wild-type controls (J. Sallinen et al., Mol. Psychiatry, vol.4, 1999, p.443-452). Therefore, an increase in the forced swimming activity can be used as a measure of in vivo alpha-2C selective antagonism of a compound. The non-selective antagonist atipamezole did not have a clear stress-protective effect and even increased vocalizations of test animals (T. Kauppila et al., Eur. J. Pharmacol., vol.205, 1991, p.177-182). This may have resulted from the simultaneous alpha-2A antagonistic activity of atipamezole, since conventionally non-selective alpha-2 adrenoceptor antagonists, such as yohimbine, have been found to be anxiogenic (S. Southwick et al., Arch. Gen. Psychiatry, vol.54, 1997, p.749- 758).
The forced swim test was conducted as originally described employing the stress sensitive (J. Crawley and L. Davis, Brain Research Bulietin, vol.8, 1982, p.609-612, and US-A-5 902 807) Balb/c mouse strain (B&K, Sweden).
The mice were administered either with vehicle (0.1% DMSO, 5 ml/kg subcutaneously), Compound 1 0.3 umol/kg, or atipamezole 0.3 umol/kg 40 min } before putting the mice into a vessel (10 cm diameter, 18.5 cm height, filled with 25°C water up to 8 cm height). The cumulative activity of each mouse was measured between 2 and 6 min after introduction to the vessel. Only vigorous attempts to escape (climbing) were registered. The mice (a total of 96) were tested only once. The results are shown in Figure 2. ) Mice administered with Compound 1 tolerated clearly better stress- induced propagation of behavioural despair when compared to vehicle injected ) 5 group of mice (1-way ANOVA, followed by LSD post hoc test; p = 0.013) as was expected for an alpha-2C selective compound. Atipamezole did not have any clear effect on the activity compared to control mice (p = 0.52). A possible marginal effect of atipamezole was expected, since this subtype-non-selective alpha-2 antagonist blocks also the alpha-2C adrenoceptors. On the other hand the employed 0.3 umol/kg dose of atipamezole was shown to have also alpha2A antagonism in vivo (Figure 1). The employed doses of atipamezole have also been shown to have clear neurochemical effects, i.e. to stimulate noradrenaline release in brain (A. Haapalinna et al., Naunyn-Schimiedeberg's
Arch. Pharmacol. Vol.356, 1997, p.570-582). Therefore, the results support that alpha-2A adrenoceptor antagonism of atipamezole can counteract the stress- protective and antidepressant effects of alpha-2C antagonism in vivo (J.
Sallinen et al., Mol. Psychiatry, vol.4, 1999, p.443-452, and US-A-5 902 807).
In general, the compounds of the invention exhibiting alpha-2 adrenoceptor antagonistic activity may be useful for the treatment of diseases or conditions wherein alpha-2 antagonists are effective. For example, the compounds can be used to treat disorders of the central nervous system, male sexual impotence, orthostatic hypotension, non-insulin dependent diabetes, and obesity, for example, disorders of the central nervous system. The compounds can also be used to reverse effects induced by alpha-2 agonists. Disorders of the central nervous system treatable with the compounds of the invention include depression, anxiety, post traumatic stress disorder, schizophrenia, Parkinson's disease, and other movement disorders.
The selective alpha-2C antagonists of the present invention may be used for the treatment of various diseases or conditions of CNS-system where alpha2C-antagonists are indicated to be beneficial (see e.g. US-A-5 902 807, J.
Sallinen et al., Neuroscience, vol. 86, 1998, p.959-965, J. Sallinen et al., J.
Neurosci., vol.18, 1998, p.3035-3042, and M. Bjorklund et al., Molecular
Pharmacology, vol.54, 1998, p.569-76, the contents of which are hereby incorporated by reference), for example, in the treatment of schizophrenia and depression. Furthermore, the present alpha-2C antagonists can be used as stress-protective agents, or as agents for the treatment of CNS-disorders induced by stress, e.g. of post-traumatic stress disorder, as indicated, for example, in US-A-5 902 807 cited above. Because alpha-2C antagonists appear to stimulate central dopaminergic activity, they can be used as antiparkinsonian agents in Parkinson's disease and other movement disorders.
Moreover, the present alpha-2C antagonists may also exhibit cognition enhancing properties and thus may be used in the treatment of Alzheimer's disease and other dementias.
Due to the selectivity of tissue distribution, the alpha-2C antagonists of the invention have less or no undesirable side-effects, such as cardiovascular effects.
The compounds of the invention may be administered enterally, topically or parenterally.
The compounds of the invention may be formulated alone or together with another active ingredient and/or together with a pharmaceutically acceptable diluent, carrier and/or excipient in different pharmaceutical unit dosage forms, e.g. tablets, capsules, solutions, emulsions and powders etc, depending on the route of adminstration, using conventional techniques. The pharmaceutically acceptable diluent, carrier and/or excipient can be selected from those conventionally used in the field of pharmaceuticals noticing the chosen route of administration.
The amount of the active ingredient in a dosage form may vary from, for example, 0.01 to 75 weight-% depending on, for example, the type of the dosage form.
The specific dose level of the compounds of the invention depends on several factors such as the compound to be administered, the species, age and the sex of the subject to be treated, the condition to be treated and on the route and method of administration. Accordingly, the dosage for parenteral administration is typically from 0.5 ng/kg to 10 mg/kg per day and that for oral administration is from 5 pg/kg to 100 mg/kg for an adult male.
The present invention further provides a compound of the invention for : use as alpha-2 antagonist. Furthermore, a method for the treatment of diseases or conditions where alpha-2 antagonists, e.g. alpha-2C antagonists, are indicated to be useful, e.g. a method for the treatment of diseases or conditions of the central nervous system, is provided. In such a method a therapeutically effective amount of a compound of the invention is administered to a subject in need of such treatment. The use of the compounds of the invention for the manufacture of a medicament to be used for the above indications is also provided.
Those skilled in the art will appreciate that the embodiments described in this application could be modified without departing from the broad inventive concept. Those skilled in the art also understand that the invention is not limited to the particular disclosed embodiments, but is intended to also cover modifications to the embodiments that are within the spirit and scope of the invention.

Claims (48)

  1. CLAIMS i 1. Use of a compound of formula 1, NR,R; ay NR, Xn Ra ~ (Rm N Rb wherein, R14 is H or (C1-Cg)alkyl; each Ro is independently OH, halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, (C4- Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH2, mono- or di(Cq-Cg)alkylamino, (C1- Cg)alkyl-S- or hydroxy(C4-Cg)alkyl; A is a benzene ring or (C5-C7)cycloalkyl; when A is a benzene ring each Rg is independently OH, halogen, (C4- Cg)alkyl, (Co-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH2, mono- or di(C1-Cg)alkylamino, (C1-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkylcarbamoyl, (Cq-Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NH2-CO-; when A is (C5-C7)cycloalkyl each R3 is independently OH, halogen, (C4- } Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C4-Cg)alkylamino or hydroxy(C4-Cg)alkyl;
    R4 and Rg form, together with the N-atom to which they are attached, NN : —N, X _/ wherein X is O or =NRg; Rg is H, OH, NH», (C1-Cg)alkyl, (Co-Cg)alkenyl, CN-(C1-Cg)alkyl, (C1-Cg)alkoxy-CO-(C1-Cg)alkyl, (C1-Cg)alkyl-CO-, NH»-CO-, mono- or di(C4-Cg)alkylcarbamoyl, hydroxy(C1-Cg)alkyl, (C3-Cg)cycloalky, phenyl, naphthyl or benzyl, wherein the said phenyl, naphthyl or benzyl is optionally substitued with one to three substituent(s) each independently being OH, halogen, NO2, NH, (C1-Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C1- Cg)alkylamino or halo-(C1-Cg)alkyl;
    or R4 and Rg form, together with the N-atom to which they are attached, /(CH,)n Nd (Rg)r wherein n = 1 or 2; Rg is as defined above; and r = 0 to 3;
    or R4 and Rg form, together with the N-atom to which they are attached, 1- imidazolyl, 1-imidazolinyl or 1-triazolyl, each of which can optionally be substituted with one to three substituent(s) R7 each independently being (C 1- Cg)alkyl and NHo;
    or one of R4 and Rg is -SO2Rg and the other of R4 and Rs is H or (Cy- Cg)alkyl; Rg is (C1-Cg)alkyl, phenyl, naphthyl or benzyl, wherein the said phenyl, naphthyl or benzyl is optionally substituted with one to three substituent(s) Rg each independently being OH, halogen, NO2, NH», (C4- Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C1-Cg)alkylamino; Ra and Rb are independently H, OH, halogen, (C4-Cg)alkyl, (C2- Cg)alkenyl, (Co-Cg)alkynyl, (C1-Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NHo, mono- or di(Cq-Cg)alkylamino, (C1-Cg)alkyl-S- or CN;
    or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring optionally substituted with one to three substituent(s) R'3 each independently being OH, halogen, (C1-Cg)alkyl, (Co- Cg alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NHp, mono- or di(C1- Cg)alkylamino, (C1-Cg)alkyl-CO-, mono- or di(C4-Cg)-alkylcarbamoyl, (C1- ) Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NH2-CO-; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to four substituent(s) R41 each independently being OH, halogen, (C4-Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-Cg)alkyl, or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed bicyclo[2.2.1]-heptane ring optionally substituted with one to four substituent(s) each independently being OH, halogen, (C1-Cg)alkyl or (Cq-Cg)alkoxy; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five or six membered heterocyclic ring with one ring heteroatom =NR14, which heterocyclic ring is optionally substituted with one to three substituent(s) R1q as defined above; R44 is H or (C41-Cg)alkyl, or Rq1 is phenyl optionally substituted with one to three substituents Rq2 each independently being OH, halogen, NO2, NH2, (C1-Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C1-Cg)alkylamino; mis 0 to 3; and tis Oto 3, or of a pharmaceutically acceptable salt or ester thereof, for the manufacture of a medicament for the treatment of diseases or conditions where antagonists of alpha-2 adrenoceptors are indicated to be useful.
  2. 2. The use of claim 1, wherein the compound of formula | is a compound of formula IA
  3. 3. NR, SN IA (CH,)i = » (Ry)m N (Ryo) or a pharmaceutically acceptable salt or ester thereof, wherein Rq, Rp, R3, R4, Rs, R10, m and t are as defined in claim 1; iis 1 to 3; and jis 0 to 4.
    3. The use of claim 1, wherein the compound of formula | is a compound of formula IB NR Rs NR, IB ~ Ra = (Ry)m N Rb or a pharmaceutically acceptable salt or ester thereof, wherein A, R{, Ro, R3, R4, Rg, m and t are as defined in claim 1; and Ra . and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, (Co- Cg)alkynyl, (C4-Cg)alkoxy, halo(C4-Cg)alkyl, NO2, NH2, mono- or di(C4- Cg)alkylamino, (C1-Cg)alkyl-S- or CN; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to three substituent(s) Rg each independently being OH, halogen, (C1-Cg)alkyl, (Cq- Cg alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-Cg)alkyl.
  4. 4. The use of claim 1, wherein the compound of formula | is a compound of formula IC NR,Rs 3, NR, a (Ryo) IC (CH) — NT 2 (R,)m N Ris or a pharmaceutically acceptable salt or ester thereof, wherein R1, Ro, R3, R4, Rs, R10, R11, mand t are as defined in claim 1; i is1or2;andjis Oto 3.
  5. 5. The use of claim 1, wherein the compound of formula | is a compound of formula ID NR,R, = NR, ID ~~ i = (R,)m N (Rp or a pharmaceutically acceptable salt or ester thereof, wherein Rq, Rp, Ra, R'3, R4, Rs, m and t are as defined in claim 1; and p is 0 to 3. i 5
  6. 6. The use of a compound of formula | according to claim 5, wherein mis 1 and R3 is (C1-Cg)alkoxy.
  7. 7. The use of a compound of formula | according to any on of claims 1 to 6, wherein R4 and Rg form, together with the N-atom to which they are attached, 7 —N X _/ wherein X is as defined in claim 1.
  8. 8. The use of a compound of formula | according to any one of claims 1 to 7, wherein X is =NRg.
  9. 9. The use of a compound of formula | according to claim 8, wherein Rg is (C1-Cg)alkyl, (C1-Cg)alkenyl, (C3-Cg)cycloalkyl or hydroxy(C4-Cg)alkyl.
  10. 10. The use of a compound of formula | according to claim 9, wherein Rg is (C1-Cg)alkyl.
  11. 11. The use of a compound of formula | according to any one of claims 1 to 10 for the manufacture of a medicament for use as a selective alpha-2C antagonist.
  12. 12. The use according to any one of claims 1 to 11 for the manufacture of a medicament for the treatment of various disorders of central nervous system.
  13. 13. A compound of formula Il,
    NR,R, ay NR; Il Xn Ra 2 (R,)m N Rb or of a pharmaceutically acceptable salt or ester thereof, wherein, R4 is H or (C1-Cg)alkyl; each Ro is independently OH, halogen, (C1-Cg)alkyl, (C2-Cg)alkenyl, (Cq-
    Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH2, mono- or di(C1-Cg)alkylamino, (C1- Cg)alkyl-S- or hydroxy(C4-Cg)alkyl,
    A is a benzene ring or (C5-C7)cycloalkyl;
    when A is a benzene ring each R3 is independently OH, halogen, (C1- Cg)alkyl, (C2-Cg)alkenyl, (C1-Cg)alkoxy, halo-(C1-Cg)alkyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C1-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkylcarbamoyl, (C1-Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NH2-CO-;
    when A is (C5-C7)cycloalkyl each Rg is independently OH, halogen, (C4- Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C4-Cg)alkylamino or hydroxy(C1-Cg)alkyl;
    R4 and Rg form, together with the N-atom to which they are attached, ) —N X /
    wherein X is O or =NRg; Rg is H, OH, NH», (C1-Cg)alkyl, (C2-Cg)alkenyl, CN-(C4-Cg)alkyl, (C1-Cg)alkoxy-CO-(C1-Cg)alkyl, (C1-Cg)alkyl-CO-, NH2-CO-, ] mono- or di(C1-Cg)alkylcarbamoyl, hydroxy(C4-Cg)alkyl, (C3-Cg)cycloalkyl or benzyl, wherein the said benzyl is optionally substitued with one to three substituent(s) each independently being OH, halogen, NO2, NH2, (C1-Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C4-Cg)alkylamino or halo-(C1-Cg)alkyl; or R4 and Rg form, together with the N-atom to which they are attached, / (CH, —N wd (Rg)r wherein n = 1 or 2; Rg is as defined above; and r = 0 to 3;
    or Rg and Rg form, together with the N-atom to which they are attached, 1- imidazolyl, 1-imidazolinyl or 1-triazolyl, each of which can optionally be substituted with one to three substituent(s) R7 each independently being (C1-
    Cg)alkyl or NHp;
    Ra and Rb are independently H, OH, halogen, (C1-Cg)alkyl, (Co- Cg)alkenyl, (Co-Cg)alkynyl, (C1-Cg)alkoxy, halo(C4-Cg)aikyl, NO2, NH2, mono- or di(C4-Cg)alkylamino, (C1-Cg)alkyl-S- or CN;
    or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring optionally substituted with one to three substituent(s) R'3 each independently being OH, halogen, (C1-Cg)alkyl, (C2- Cg)alkenyl, (C1-Cg)alkoxy, halo-(C4-Cg)alkyl, NO2, NHp, mono- or di(C1-
    Cg)alkylamino, (C4-Cg)alkyl-CO-, mono- or di(C1-Cg)-alkylcarbamoyl, (C1- Cg)alkyl-S-, hydroxy(C1-Cg)alkyl or NH2-CO-;
    or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to four substituent(s) R1g each independently being OH, halogen, (C4-Cg)alkyl, (C1-Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-Cg)alkyl;
    or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed bicyclo[2.2.1]-heptane ring optionally substituted with one to four substituent(s) each independently being OH, halogen, (C1-Cpg)alkyl ) or (C1-Cg)alkoxy; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five or six membered heterocyclic ring with one ring heteroatom =NR1 1, which heterocyclic ring is optionally substituted with one to three substituent(s) Rg as defined above; R11 is H or (C4-Cg)alkyl, or R41 is phenyl optionally substituted with one to three substituents R12 each independently being OH, halogen, NO2, NH2, (C1-Cg)alkyl, (C1-Cg)alkoxy or mono- or di(C1-Cg)alkylamino; mis 0 to 3; and tis Oto 3, with the provisos, that a) when A is a benzene ring, mis 0 or 1, tis 0, Rq is H, R3 is Cl or NOp, and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring, and X is NRg, then Rg is not H, —CH3, - CHoCHg3, -COCHg3, or -CO-NH); b) when A is a benzene ring, then Ra and Rb are not at the same time H; c) when A is a benzene ring, mis 1, tis 0, R{ is H, and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed benzene ring, which is optionally substituted with Br, and X is O, then R3 is not NO2 or -OCHg; d) when A is a benzene ring, mis 0, tis 0, Rq is H, and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed
    . nonsubstituted benzene ring, then X is not O; ’ 35 e) the compound is not 4-[4-[(7-Chloro-2-methyi-4-quinolinyl)amino]phenyl]- 1-diethylcarbamoylpiperazine, 4-[4-[(6-Chloro-2-methoxy-9- acridinyl)amino]phenyl}-1-diethylcarbamoylpiperazine, 6-amino-4-[[3-chioro-4- (1H-imidazol-1 -yl)phenyl]lamino]-7-metoxy-3-quinolinecarbonitrile or 4-[[3-
    chloro-4-(1H-imidazol-1-yl)phenyllamino]-7-methoxy-6-nitro-3- quinolinecarbonitrile.
  14. 14. A compound according to claim 13, which is a compound of formula lA, NR Rs
    3. NR, XN HA (CH)
    ~ . (Ry)m N (Ryo) or a pharmaceutically acceptable salt or ester thereof, wherein R4, Rg, Ra, Rg, Rg, R1g, m and t are as defined in claim 1; iis 1 to 3;and jis 0 to 4.
  15. 15. A compound according to claim 14, wherein iis 2,jis 0 or 1 and Ryq is (C4-C3z)alkyl.
  16. 16. A compound according to any one of claims 14 or 15, wherein mis 0 or 1 and R3 is (C4-C3)alkyl or halogen.
  17. 17. A compound according to any one of claims 14 to 16, wherein the compound is [4-(4-Methylpiperazin-1-yl)phenyl]-(1 ,2,3,4-tetrahydroacridin-9- yl)amine, 2-{4-[4-(1 .2,3,4-Tetrahydroacridin-9-yl)aminophenyl]piperazin-1- yl}ethanol, [4-(4-Methylpiperazin-1-yl)phenyl}-(2-methyl-1 ,2,3,4-tetrahydro- acridin-9-yl)amine, (8-Fiuoro-1,2,3,4-tetrahydroacridin-9-yl)-[4-(4- methylpiperazin-1-yl)phenyl]lamine, [4-(4-Methylpiperazin-1-yl)phenyl]-(2,7-
    . 25 dimethyl-1,2,3,4-tetrahydroacridin-9-yl)amine, [4-(4-Methylpiperazin-1- yl)phenyl]-(7,8,9,1 0-tetrahydro-6H-cycloheptafb]quinolin-11-yl)amine or [4-(4- Methylpiperazin-1-yl)phenyl]-(1,1,3,3-tetramethyl-1,2,3 4-tetrahydroacridin-9- yl)amine.
  18. 18. A compound according to claim 13, which is a compound of formula ine, . NR,R; NR, l= x Ra = (Rym N Rb or a pharmaceutically acceptable salt or ester thereof, wherein A, Rq, Ro, R3, R4, Rs, m and t are as defined in claim 1; and Ra and Rb are independently H, OH, halogen, (C4-Cg)alkyl, (C2- Cg)alkenyl, (C2-Cg)alkynyl, (C1-Cg)alkoxy, halo(C1-Cg)alkyl, NO2, NH», mono- or di(C1-Cg)alkylamino, (C1-Cg)alky!-S- or CN; or Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring optionally substituted with one to three substituent(s) Rqp ; each independently being OH, halogen, (C4-Cg)alkyl, (C4- Cg)alkoxy, mono- or di(C1-Cg)alkylamino or hydroxy(C1-Cg)alkyl.
  19. 19. A compound according to claim 18, wherein A is a benzene ring.
  20. 20. A compound according to any one of claims 18 or 19, wherein mis 0 or
    1.
  21. 21. A compound according to any one of claims 18 to 20, wherein R3 is (C4-Cg)alkyl or (C1-Cg)alkoxy.
  22. 22. A compound according to any one of claims 18 to 21, wherein Ra and . Rb are independently H or (C1-C3)alkyl, wherein the (C4-Ca)alkyl includes both straight and branched chain radicals of up to 3 carbon atoms.
  23. 23. A compound according to claim 18, wherein A is a six membered carbocyclic ring and Ra and Rb form, together with the carbon ring atoms to which they are attached, a condensed five to seven membered carbocyclic ring, wherein said carbocyclic rings can optionally be substituted with one to three substitutent(s) each independently being OH, halogen, (C4-Cg)alkyl, (C1- Cg)alkoxy or hydroxy(C4-Cg)alkyl.
  24. 24 A compound according to any one of claims 18 to 23, wherein the compound is (3-Ethyl-2,8-dimethylquinolin-4-yl)-[4-(4-methylpiperazin-1- yl)phenyllamine, (2-Methylquinolin-4-yl)-{4-(4-methylpiperazin-1- yhphenyljamine, (3-Ethyl-2,6-dimethylquinolin-4-yl)-[4-(4-methylpiperazin-1- yl)phenyllamine, (3-Ethyl-6-methoxy-2-methylquinotin-4-yl)-[4-(4- methylpiperazin-1-yl)phenyl]lamine, (3-Ethyl-2-methylquinolin-4-yl)-[4-(4- methylpiperazin-1-yl)phenyllamine, 4-[4-(4-Methylpiperazin-1- yl)phenylaminojquinoline-3-carbonitrile, (3-1sopropyl-2-methylquinolin-4-yl)-[4- (4-methylpiperazin-1-yl)phenylJamine, (2,3-Dimethylquinolin-4-yl)-[4-(4- methylpiperazin-1-yl)phenylilamine, [4-(4-Methylpiperazin-1 -yhphenyl}- (1,2,3,4,5,6,7,8-octahydroacridin-9-yl)amine or (3-Ethyl-2-methylquinolin-4-yl)- methyl-[4-(4-methylpiperazin-1-yl)phenyljamine.
  25. 25. A compound according to claim 13, which is a compound of formula IC, NR Rs
    3. NR, § or ne i = NT 2 (Ry)m NC Ri or a pharmaceutically acceptable salt or ester thereof,
    wherein Rq, Ro, R3, Rg, Rs, R10, R11, m and t are as defined in claim 1; i is1or2;andjis 0 to 3.
  26. 26. A compound according to claim 13, which is a compound of formula . 5 ID, NR,R, Ce NR, ID ~~ ~~ (Ry)m N (R';)p or a pharmaceutically acceptable salt or ester thereof, wherein R14, Ro, R3, R'3, R4,R5, m and t are as defined in claim 1; and p is Oto 3.
  27. 27. A compound according to claim 26, wherein mis 1 and R3 is (C1- Ceg)alkoxy.
  28. 28.A compound according to any one of claims 26 or 27, wherein the compound is 2-{4-[4-(Acridin-9-yl)aminophenyl]piperazin-1-yl}-ethanol, (4- Methoxyacridin-9-yl)-[4-(4-methylpiperazin-1-yl)-phenyl]lamine, Acridin-9-yi-[4- (piperidin-1-yl)phenyllamine, Acridin-9-yl-[4-(4-benzylpiperazin-1- yl)phenyllamine, Acridin-9-yl-[4-(4-methylpiperidin-1-yl)phenyljamine, Acridin-9- yl-[4-(3-hydroxymethylpiperidin-1-yl)phenyl]amine, Acridin-9-yl-[4-(pyrrolidin-1- y)phenyllamine, Acridin-9-yl-[4-(4-cyclopropylpiperazin-1-yl)phenyllamine, Acridin-9-yl-[4-(4-isopropylpiperazin-1-yl)phenyllamine, (Acridin-9-yl)-methyl-[4- (4-methylpiperazin-1-yl)phenyijamine or Acridin-9-yl-[2,5-diethoxy-4-(morpholin- ’ 4-yhphenyllamine. ’ 29. A compound according to any one of claims 13 to 28, wherein Rq and Rg form, together with the N-atom to which they are attached,
  29. PCT/FR01/00203 —N NR wherein Rg is (Cq-Cglalkyl, (C4-Cglalkenyl, (C3-Cglcycloalkyl or hydroxy(C4-Cglalkyl.
  30. 30. A compound according to claim 29, wherein Rg is (C4-Cglalkyl.
  31. 31. A pharmaceutical composition comprising a compound of formula Il according to claim 13 as an active ingredient optionally together with a pharmaceutically acceptable diluent, carrier and/or excipient.
  32. 32. A substance or composition for use in a method for the treatment of diseases or conditions where antagonists of alpha-2 adrenoceptors are indicated to be useful, said substance or composition comprising a compound of formula as defined in claim 1, and said method comprising administering said substance or composition.
  33. 33. A substance or composition for use in a method of treatment of claim 32, wherein the compound of formula | is a compound of formula IA as defined in claim 2.
  34. 34. A substance or composition for use in a method of treatment of claim 32, wherein the compound of formula | is a compound of formula IB as defined in claim 3.
  35. 35. A substance or composition for use in a method of treatment of claim 32, wherein the compound of formula | is a compound of formula IC as defined in claim 4. AMENDED SHEET
    PCT/FR01/00203
  36. 36. A substance or composition for use in a method of treatment of claim 32, wherein the compound of formula | is a compound of formula ID as defined in claim 5.
  37. 37. A substance or composition for use in a method of treatment according to claim 36, wherein mis 1 and Rg is (C;-Cglalkoxy.
  38. 38. A substance or composition for use in a method of treatment according to any one of claims 32 to 37, wherein R, and Rg form, together with the N-atom to which they are attached, —N X _/ wherein X is as defined in claim 1.
  39. 39. A substance or composition for use in a method of treatment according to any one of claims 32 to 38, wherein X is =NRg.
  40. 40. A substance or composition for use in a method of treatment according to claim 39, wherein Re is (Cq1-Cglalkyl, (C4-Cglalkenyl, (C4-Cgleycloalkyl or hydroxy(C-Cglalkyl.
  41. 41. A substance or composition for use in a method of treatment according to claim 40, wherein Rg is (C4-Cglalkyl.
  42. 42. A substance or composition for use in a method of treatment according to any one of claims 32 to 41 for the manufacture of a medicament for use as a selective alpha-2C antagonist. : AMENDED SHEET
    PCT/FRO1/(0203
  43. 43. A substance or composition for use in a method of treatment according to any one of claims 32 to 42 for the manufacture of a medicament for the treatment of various disorders of central nervous system.
  44. 44. Use according to any one of claims 1 to 12, substantially as herein described and illustrated.
  45. 45. A compound according to any one of claims 13 to 30, substantially as herein described and illustrated.
  46. 46. A composition according to claim 31, substantially as herein described and illustrated.
  47. 47. A substance or composition for use in a method of treatment according to any one of claims 32 to 43, substantially as herein described and illustrated.
  48. 48. A new use of a compound as defined in claim 1, a new compound, a new composition, or a substance or composition for a new use in a method of treatment, substantially as herein described. AMENDED SHEET
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