AU677267C - Butenyl-substituted taxanes and composition - Google Patents
Butenyl-substituted taxanes and compositionInfo
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- AU677267C AU677267C AU56670/94A AU5667094A AU677267C AU 677267 C AU677267 C AU 677267C AU 56670/94 A AU56670/94 A AU 56670/94A AU 5667094 A AU5667094 A AU 5667094A AU 677267 C AU677267 C AU 677267C
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Description
Butβnyl-substituted taxanes and composition.
BACKGROUND OF THE INVENTION
The present invention is directed to novel taxanes which have utility as antileukemia and antitumor agents.
The taxane family of terpenes, of which taxol is a member, has attracted considerable interest in both the biological and chemical arts. Taxol is a promising cancer chemotherapeutic agent with a broad spectrum of antileuke ic and tumor-inhibiting activity. Taxol has a 2'R, 3'S configuration and the following structural formula:
C
wherein Ac is acetyl. Because of this promising activity, taxol is currently undergoing clinical trials in both France and the United States.
Colin et al. reported in U.S. Patent No.
4,814,470 that taxol derivatives having structural formula (2) below, have an activity significantly greater than that of taxol (1) .
R' represents hydrogen or acetyl and one of R" and R' ' ' represents hydroxy and the other represents tert-butoxy- carbonylamino and their stereoisomeric forms, and mixtures thereof. The compound of formula (2) in which R' ' is hydroxy, R' ' ' is ter't-butoxycarbonylamino having the 2'R, 3'S configuration is commonly referred to as taxotere.
Although taxol and taxotere are promising chemotherapeutic agents, they are not universally effective. Accordingly, a need remains for additional chemotherapeutic agents.
SUMMARY OF THE INVENTION
Among the objects of the present invention, therefore, is the provision of novel taxane derivatives which are valuable antileukemia and antitumor agents.
Briefly, therefore, the present invention is directed to taxane derivatives having a C13 side chain which includes an alkyl substituent. In a preferred embodiment, the taxane derivative has a tricyclic or tetracyclic core and corresponds to the formula:
TITUTESHEET
wherein
Xx is -OX6, -SX7 , or -NX8X9 ;
X2 is hydrogen, alkyl , alkenyl , alkynyl , aryl , or heteroaryl ;
X3 is hydrogen ;
X4 is butenyl ;
X5 is -COX10, -COOX10, -COSX10, -CONX8X10, or -S02Xn; X6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, hydroxy protecting group, or a functional group which increases the water solubility of the taxane derivative;
X7 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or sulfhydryl protecting group;
X8 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl, alkynyl, aryl or heteroaryl;
X9 is an amino protecting group; X10 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl, alkynyl, aryl or heteroaryl;
Xn is alkyl, alkenyl, alkynyl, aryl, heteroaryl, -OX10, or -NX8X14; X14 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;
Rx is hydrogen, hydroxy, protected hydroxy or together with R14 forms a carbonate;
R2 is hydrogen, hydroxy, -OCOR31 or together with R2a forms an oxo;
R2a is hydrogen or taken together with R2 forms an oxo; R4 is hydrogen, together with R4a forms an oxo, oxirane or methylene, or together with R5a and the carbon atoms to which they are attached form an oxetane ring;
R4a is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cyano, hydroxy, -OCOR30, or together with R4 forms an oxo, oxirane or methylene;
R5 is hydrogen or together with R5a forms an oxo,
R5a is hydrogen, hydroxy, protected hydroxy, acyloxy, together with R5 forms an oxo, or together with R4 and the carbon atoms to which they are attached form an oxetane ring;
R6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl, hydroxy, protected hydroxy or together with R6a forms an oxo; R6a is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl, hydroxy, protected hydroxy or together with R6 forms an oxo;
R7 is hydrogen or together with R7a forms an oxo, R7a is hydrogen, halogen, protected hydroxy,
-OR8, or together with R7 forms an oxo;
R9 is hydrogen or together with R9a forms an oxo,
R9a is hydrogen, hydroxy, protected hydroxy, acyloxy, or together with R9 forms an oxo;
R10 is hydrogen or together with R10a forms an oxo,
R10a is hydrogen, -OCOR29, hydroxy, or protected hydroxy, or together with R10 forms an oxo; R14 is hydrogen,* alkyl, alkenyl, alkynyl, aryl, heteroaryl, hydroxy, protected hydroxy or together with Rx forms a carbonate;
R14a is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;
R28 is hydrogen, acyl, hydroxy protecting group or a functional group which increases the solubility of the taxane derivative; and
R 29' R 3o an< R 3ι are independently hydrogen, alkyl, alkenyl, alkynyl, monocyclic aryl or monocyclic heteroaryl.
Other objects and features of this invention will be in part apparent and in part pointed out hereinafter.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As used herein "Ar" means aryl; "Ph" means phenyl; "Ac" means acetyl; "Et" means ethyl; "R" means alkyl unless otherwise defined; "Bu" means butyl; "Pr" means propyl; "TES" means triethylsilyl; "TMS" means trimethylsilyl; "TPAP" means tetrapropylammonium perruthenate; "DMAPV means p-dimethylamino pyridine; "DMF" means dimethylformamide; "LDA" means lithium diisopropylamide; "LHMDS" means lithium hexamethyl- disilazide; "LAH" means lithium aluminum hydride; "Red- Al" means sodium bis(2-methoxyethoxy) aluminum hydride; "AIBN" means azo-(bis) -isobutyronitrile; "10-DAB" means 10-desacetylbaccatin III; FAR means 2-chloro-l,1,2- trifluorotriethylamine; protected hydroxy means -OR wherein R is a hydroxy protecting group; sulfhydryl protecting group" includes, but is not limited to, hemithioacetals such as 1-ethoxyethyl and methoxymethyl, thioesters, or thiocarbonates; "amine protecting group" includes, but is not limited to, carbamates, for example, 2,2,2-trichloroethylcarbamate or tertbutylcarbamate; and "hydroxy protecting group" includes, but is not limited to, ethers such as methyl, t-butyl, benzyl, p-methoxy- benzyl, p-nitrobenzyl, allyl, trityl, methoxymethyl, 2- methoxypropyl, methoxyethoxymethyl, ethoxyethyl, tetra- hydropyranyl, tetrahydrothiopyranyl, and trialkylsilyl
SUBSTITUTESHEET
ethers such as trimethylsilyl ether, triethylsilyl ether, dimethylarylsilyl ether, triisopropylsilyl ether and t-butyldimethylsilyl ether; esters such as benzoyl, acetyl, phenylacetyl, foππyl, mono-, di-, and trihalo- acetyl such as chloroacetyl, dichloroacetyl, trichloro- acetyl, trifluoroacetyl; and carbonates including but not limited to alkyl carbonates having from one to six carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl; isobutyl, and n-pentyl; alkyl carbonates having from one to six carbon atoms and substituted with one or more halogen atoms such as 2,2,2-trichloroethoxymethyl and 2,2,2-trichloroethyl; alkenyl carbonates having from two to six carbon atoms such as vinyl and allyl; cycloalkyl carbonates having from three to six carbon atoms such as cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl; and phenyl or benzyl carbonates optionally substituted on the ring with one or more C^g alkoxy, or nitro. Other hydroxyl, sulfhydryl and amine protecting groups may be found in "Protective Groups in Organic Synthesis" by T. . Greene, John Wiley and Sons, 1981.
The alkyl groups described herein, either alone or with the various substituents defined herein are preferably lower alkyl containing from one to six carbon atoms in the principal chain and up to 15 carbon atoms. They may be substituted, straight, branched chain or cyclic and include methyl, ethyl, propyl, isopropyl, butyl, hexyl, cyclopropyl, cyclopentyl, cyclohexyl and the like. The alkenyl groups described herein, either alone or with the various substituents defined herein are preferably lower alkenyl containing from two to six carbon atoms in the principal chain and up to 15 carbon atoms. They may be substituted, straight or branched chain and include ethenyl, propenyl, isopropenyl, butenyl, isobutenyl, hexenyl, and the like.
The alkynyl groups described herein, either alone or with the various substituents defined herein are preferably lower alkynyl containing from two to six carbon atoms in the principal chain and up to 15 carbon atoms. They may be substituted, straight or branched chain and include ethynyl, propynyl, butynyl, isobutynyl, hexynyl, and the like.
The aryl moieties described herein, either alone or with various substituents, contain from 6 to 15 carbon atoms and include phenyl. Substituents include alkanoxy, protected hydroxy, halogen, alkyl, aryl, alkenyl, acyl, acyloxy, nitro, amino, amido, etc. Phenyl is the more preferred aryl.
The heteroaryl moieties described herein, either alone or with various substituents, contain from 5 to 15 atoms and include, furyl, thienyl, pyridyl and the like. Substituents include alkanoxy, protected hydroxy, halogen, alkyl, aryl, alkenyl, acyl, acyloxy, nitro, amino, and amido. The acyloxy groups described herein contain alkyl, alkenyl, alkynyl, aryl or heteroaryl groups.
The substituents of the substituted alkyl, alkenyl, alkynyl, aryl, and heteroaryl groups and moieties described herein, may be alkyl, alkenyl, alkynyl, aryl, heteroaryl and/or may contain nitrogen, oxygen, sulfur, halogens and include, for example, lower alkoxy such as methoxy, ethoxy, butoxy, halogen such as chloro or fluoro, nitro, amino, and keto.
In accordance with the present invention, it has been discovered that compounds corresponding to structural formula 3 show remarkable properties, in vitro, and are valuable antileukemia and antitumor agents. Their biological activity has been determined in vitro, using tubulin assays according to the method of Parness et al. , J. Cell Biology. 91: 479-487 (1981) and human cancer cell lines, and is comparable to that exhibited by taxol and taxotere.
SUBSTITUTE SHEET
In one embodiment of the present invention, the substituents of the cyclic nucleus of the taxane (other than the C13 substituent) correspond to the substituents present on baccatin III or 10-DAB. That is, R14 and R14a are hydrogen, R10 is hydrogen, R10a is hydroxy or acetoxy, R9 and R9a together form an oxo, R7 is hydrogen, R7a is hydroxy, R5 is hydrogen, R5a and R4 and the carbons to which they are attached form an oxetane ring, R4a is acetoxy, R2 is hydrogen, R2a is benzoyloxy, and Rx is hydroxy. In other embodiments, the taxane has a structure which differs from that of taxol or taxotere with respect to the C13 side chain and at least one other substituent. For example, R14 may be hydroxy, R2 may be hydroxy or -OCOR31 wherein R31 is hydrogen, alkyl or selected from the group comprising
and Z is alkyl, hydroxy, alkoxy, halogen, or trifluoromethyl. R9a may be hydrogen and R9 may be hydrogen or hydroxy, R7a may be hydrogen and R7 may be acetoxy or other acyloxy or halogen, or R:0 and R10a may each be hydrogen or together form an oxo.
With respect to the C13 side-chain, in a preferred embodiment Xx is -OH, X2 is hydrogen, X3 is hydrogen, X4 is butenyl, X5 is -COX10 or -COOX10, and X10 is alkyl, alkenyl, alkynyl, aryl, furyl, thienyl or other heteroaryl and the taxane has the 2'R, 3'S configuration. In a particularly preferred embodiment, X4 is isobutenyl, X5 is -COXJO or -COOX10 and X10 is furyl, thienyl, alkyl substituted furyl or thienyl, pyridyl, tert-, iso- or n- butyl, ethyl, iso- or n-propyl, cyclopropyl, cyclohexyl, allyl, crotyl, 1,3-diethoxy-2-propyl, 2-methoxyethyl, a yl, neopentyl, PhCH20-, -NPh2, -NHnPr, -NHPh, or -NHEt.
Taxanes having the general formula 3 may be obtained by reacting a β-lactam with alkoxides having the taxane tricyclic or tetracyclic nucleus and a C-13 metallic oxide substituent to form compounds having a β-amido ester substituent at C-13 The β-lactams have the following structural formula:
wherein Xl - X5 are as defined above.
The β-lactams can be prepared from readily available materials; as is illustrated in schemes A and B below:
Scheme A
SUBSTITUTE SHEET
Scheme B
reagents: (a) triethylamine, CH2C12, 25<>C, 18h; (b) 4 equiv ceric ammonium nitrate, CH3CN, -lO^C, 10 min; (c) 5 KOH, THF, H20, 0°C, 30 min, or pyrolidme, pyridine, 25 °C, 3h, (d) TESC1, pyridine, 25 °C, 30 min or 2- methoxypropene toluene sulfonic acid (cat.), THF, OOC, 2h; (e) n-butyllithium, THF, -78 °C, 30 min; and an acyl chloride or chloroformate (X5 = -COX10) , sulfonyl chloride
10 (X5 = -COSX10) or isocyanate (X5 = -CONX8X10) ; (f) lithium diisopropyl amide, THF -78<>c to -50OC; (g) lithium hexamethyldisilazide, THF -78<>C to 0«C; (h) THF, -78oc to 25oc, 12h.
The starting materials are readily available.
15 In scheme A, α-acetoxy acetyl chloride is prepared from glycolic acid, and, in the presence of a tertiary amine, it cyclocondenses with imines prepared from aldehydes and p-methoxyaniline to give l-p-methoxyphenyl-3-acyloxy-4- arylazetidin-2-ones. The p-methoxyphenyl group can be
20 readily removed through oxidation with ceric ammonium nitrate, and the acyloxy group can be hydrolyzed under standard conditions familiar to those experienced in the
SUBSTIT T
art to provide 3-hydroxy-4-arylazetidin-2-ones. In Scheme B, ethyl-α-triethylsilyloxyacetate is readily prepared from glycolic acid.
In Schemes A and B, Xx is preferably -OX6 and X6 is a hydroxy protecting group. Protecting groups such as 2-methoxypropyl ("MOP"), 1-ethoxyethyl ("EE") are preferred, but a variety of other standard protecting groups such as the triethylsilyl group or other trialkyl (or aryl) silyl groups may be used. As noted above, additional hydroxy protecting groups and the synthesis thereof may be found in "Protective groups in Organic Synthesis" by T.W. Greene, John Wiley & Sons, 1981.
The racemic β-lactams may be resolved into the pure enantiomers prior to protection by recrystallization of the corresponding 2-methoxy-2- (trifluoromethyl) phenylacetic esters. However, the reaction described hereinbelow in which the β-amido ester side chain is attached has the advantage of being highly diastereo- selective, thus permitting the use of a racemic mixture of side chain precursor.
The alkoxides having the tricyclic or tetracyclic taxane nucleus and a C-13 metallic oxide or ammonium oxide substituent have the following structural formula:
wherein Rx - R14a are as previously defined and M comprises ammonium or is a metal optionally selected from
EET
the group comprising Group IA, Group IIA and transition metals, and preferably, Li, Mg, Na, K or Ti. Most preferably, the alkoxide has the tetracyclic taxane nucleus and corresponds to the structural formula:
MOllll
wherein M, R2, R4a, R7, R7a, R9, R9a, R10, and R10a are as previously defined.
The alkoxides can be prepared by reacting an alcohol having the taxane nucleus and a C-13 hydroxyl group with an organometallic compound in a suitable solvent. Most preferably, the alcohol is a protected baccatin III, in particular, 7-O-triethylsilyl baccatin
III (which can be obtained as described by Greene, et al. in JACS 110: 5917 (1988) or by other routes) or 7,10-bis-O-triethylsilyl baccatin III.
As reported in Greene et al. , 10-deacetyl baccatin III is converted to 7-O-triethylsilyl-10- deacetyl baccatin III according to the following reaction scheme:
OCOC6H5
1. C^H^SI Cl , C5H5N
2. CHgCOCI ., C5H5N
(4) a, R=H b, R=COCH3
Under what is reported to be carefully optimized conditions, 10-deacetyl baccatin III is reacted with 20 equivalents of (C2H5)3SiCl at 23°C under an argon atmosphere for 20 hours in the presence of 50 ml of pyridine/mmol of 10-deacetyl baccatin III to provide 7-triethylsilyl-10-deacetyl baccatin III (4a) as a reaction product in- 84-86% yield after purification. The reaction product may then optionally be acetylated with 5 equivalents of CH3C0C1 and 25 mL of pyridine/mmol of 4a at 0 °C under an argon atmosphere for 48 hours to provide 86% yield of 7-O-triethylsilyl baccatin III (4b) . Greene, et al. in JACS 110, 5917 at 5918 (1988).
The 7-protected baccatin III (4b) is reacted with an organometallic compound such as LHMDS in a
TESHEET
solvent such as tetrahydrofuran ( THF) , to form the metal alkoxide 13 -0-lithium-7-0-triethylsilyl baccatin III as shown in the following reaction scheme :
L HMD S +
T H F
I
As shown in the following reaction scheme, 13-0-lithium-7-0-triethylsilyl baccatin III reacts with a β-lactam in which Xt is preferably -OX6, (X6 being a hydroxy protecting group) and X2 - X5 are as previously defined to provide an intermediate in which the C-7 and C-2' hydroxyl groups are protected. The protecting groups are then hydrolyzed under mild conditions so as not to disturb the ester linkage or the taxane substituents.
SUBSTITUTE SHEET
MOIIII
C I D T H F
C 2 D H F , Py r i d i ne , C H 3 C N
Both the conversion of the alcohol to the alkoxide and the ultimate synthesis of the taxane derivative can take place in the same reaction vessel. Preferably, the β-lactam is added to the reaction vessel after formation therein of the alkoxide.
Compounds of formula 3 of the instant invention are useful for inhibiting tumor growth in animals including humans and are preferably administered in the form of a pharmaceutical composition comprising an effective antitumor amount of compound of the instant invention in combination with a pharmaceutically acceptable carrier or diluent.
Antitumor compositions herein may be made up in any suitable form appropriate for desired use; e.g., oral, parenteral or topical administration. Examples of parenteral administration are intramuscular, intravenous, intraperitoneal, rectal and subcutaneous administration.
The diluent or carrier ingredients should not be such as to diminish the therapeutic effects of the antitumor compounds.
Suitable dosage forms for oral use include tablets, dispersible powders, granules, capsules, suspensions, syrups, and elixirs. Inert diluents and carriers for tablets include, for example, calcium carbonate, sodium carbonate, lactose and talc. Tablets may also contain granulating and disintegrating agents such as starch and alginic acid, binding agents such as starch, gelatin and acacia, and lubricating agents such as magnesium stearate, stearic acid and talc. Tablets may be uncoated or may be coated by unknown techniques; e.g., to delay disintegration and absorption. Inert diluents and carriers which may be used in capsules include, for example, calcium carbonate, calcium phosphate and kaolin. Suspensions, syrups and elixirs may contain conventional excipients, for example, methyl cellulose, tragacanth, sodium alginate; wetting agents, such as lecithin and polyoxyethylene stearate; and preservatives, e.g., ethyl- p-hydroxybenzoate. Dosage forms suitable for parenteral administration include solutions, suspensions, dispersions, emulsions and the like. They may also be manufactured in the form of sterile solid compositions which can be dissolved or suspended in sterile injectable medium immediately before use. They may contain suspending or dispersing agents known in the art.
The water solubility of compounds of formula (3) may be improved by modification of the C2' and/or C7 substituents. For instance, water solubility may be increased if X: is -OX6 and R7a is -OR28, and X6 and R28 are independently hydrogen or -COGCOR1 wherein
G is ethylene, propylene, -CH=CH-, 1,2-cyclo- hexane, or 1,2-phenylene,
R1 = OH base , NR2R3 , OR3 , SR3 , OCH2CONR4R5 , OH
R2 = hydrogen, methyl R3 = (CH2)nNR6R7; (CH2)nN®R6R7R8Xβ n = 1 to 3
R4 = hydrogen, lower alkyl containing 1 to 4 carbons
R5 = hydrogen, lower alkyl containing 1 to 4 carbons, benzyl, hydroxyethyl, CH2C02H, dimethylaminoethyl R6R7 = lower alkyl containing 1 or 2 carbons, benzyl or R6 and
R7 together with the nitrogen atom of NR6R7 form the following rings
R8 = lower alkyl containing 1 or 2 carbons , benzyl
Xθ = halide base = NH3 , (HOC2H4 ) 3N, N (CH3 ) 3 , CH3N (C2H4OH) 2 ,
NH2 ( CH2 ) 6NH2 , N-methy lglucamine , NaOH ,
KOH . The preparation of compounds in which X1 or X2 is -COGCOR1 is set forth in Haugwitz U.S. Patent 4,942,184 which is incorporated herein by reference.
Alternatively, solubility may be increased when X-, is -OX6 and X6 is a radical having the formual -COCX=CHX or -COX-CHX-CHX-S020-M wherein X is hydrogen, alkyl or aryl and M is hydrogen, alkaline metal or an ammonio group as described in Kingston et al. , U.S. Patent No. 5,059,699 (incorporated herein by reference). Taxanes having alternative C9 keto substituent may be prepared by selectively reduced to yield the corresponding C9 β-hydroxy derivative. The reducing
agent is preferably a borohydride and, most preferably, tetrabutylammoniumboro-hydride (Bu4NBH4) or triacetoxy- borohydride.
As illustrated in Reaction Scheme 1, the reaction of baccatin III with Bu4NBH4 in methylene chloride yields 9-desoxo-9β-hydroxybaccatin III 5. After the C7 hydroxy group is protected with the triethylsilyl protecting group, for example, a suitable side chain may be attached to 7-protected-9β-hydroxy derivative 6 as elsewhere described herein. Removal of the remaining protecting groups thus yields 9β-hydroxy-desoxo taxol or other 9β-hydroxytetracylic taxane having a C13 side chain.
REACTION SCHEME 1
Alternatively, the C13 hydroxy group of 7- protected-9β-hydroxy derivative 6 may be protected with trimethylsilyl or other protecting group which can be selectively removed relative to the C7 hydroxy protecting group as illustrated in Reaction Scheme 2, to enable further selective manipulation of the various substituents of the taxane. For example, reaction of 7,13-protected-9β-hydroxy derivative 7 with KH causes the acetate group to migrate from CIO to C9 and the hydroxy group to migrate from C9 to CIO, thereby yielding 10- desacetyl derivative 8. Protection of the CIO hydroxy group of 10-desacetyl derivative 8 with triethylsilyl yields derivative 9. Selective removal of the C13 hydroxy protecting group from derivative 9 yields derivative 10 to which a suitable side chain may be attached as described above.
SUBSTITUTE SHEET
REACTION SCHEME 2
8
HF pyr ϊ ϊ ne
10
As shown in Reaction Scheme 3, 10-oxo derivative 11 can be provided by oxidation of 10-
desacetyl derivative 8. Thereafter, the C13 hydroxy protecting group can be selectively removed followed by attachment of a side chain as described above to yield 9- acetoxy-10-oxo-taxol or other 9-acetoxy-lO-oxotetracylic taxanes having a C13 side chain. Alternatively, the C9 acetate group can be selectively removed by reduction of 10-oxo derivative 11 with a reducing agent such as samarium diiodide to yield 9-desoxo-10-oxo derivative 12 from which the C13 hydroxy protecting group can be selectively removed followed by attachment of a side chain as described above to yield 9-desoxo-10-oxo-taxol or other 9-desoxo-10-oxotetracylic taxanes having a C13 side chain.
REACTION SCHEME 3
TM
12
SUBSTITUTE SHEET
Reaction Scheme 4 illustrates a reaction in which 10-DAB is reduced to yield pentaol 13. The C7 and CIO hydroxyl groups of pentaol 13 can then be selectively protected with the triethylsilyl or another protecting group to produce triol 14 to which a C13 side chain can be attached as described above or, alternatively, after further modification of the tetracylic substituents.
REACTION SCHEME 4
1 4 Taxanes having C9 and/or CIO acyloxy substituents other than acetate can be prepared using 10- DAB as a starting material as illustrated in Reaction Scheme 5. Reaction of 10-DAB with triethylsilyl chloride in pyridine yields 7-protected 10-DAB 15. The CIO hydroxy substituent of 7-protected 10-DAB 15 may then be readily acylated with any standard acylating agent to
SUBSTITUTE SHEET
yield derivative 16 having a new CIO acyloxy substituent. Selective reduction. of the C9 keto substituent of derivative 16 yields 9β-hydroxy derivative 17 to which a C13 side chain may be attached. Alternatively, the CIO and C9 groups can be caused to migrate as set forth in Reaction Scheme 2, above.
REACTION SCHEME 5
HOlll Oll
Acy I at I ng agent
Taxanes having alternative C2 and/or C4 esters can be prepared using baccatin III and 10-DAB as starting materials . The C2 and/or C4 esters of baccatin III and 10-DAB can be selectively reduced to the corresponding alcohol (s) using reducing agents such as LAH or Red-Al, and new esters can thereafter be substituted using
SUBSTITUTE SHEET
standard acylating agents such as anhydrides and acid chlorides in combination with an amine such as pyridine, triethylamine, DMAP, or diisopropyl ethyl amine. Alternatively, the C2 and/or C4 alcohols may be converted to new C2 and/or C4 esters through formation of the corresponding alkoxide by treatment of the alcohol with a suitable base such as LDA followed by an acylating agent such as an acid chloride.
Baccatin III and 10-DAB analogs having different substituents at C2 and/or C4 can be prepared as set forth in Reaction Schemes 6-10. To simplify the description, 10-DAB is used as the starting material. It should be understood, however, that baccatin III derivatives or analogs may be produced using the same series of reactions (except for the protection of the CIO hydroxy group) by simply replacing 10-DAB with baccatin III as the starting material. 9-desoxo derivatives of the baccatin III and 10-DAB analogs having different substituents at C2 and/or C4 can then be prepared by reducing the C9 keto substituent of these analogs and carrying out the other reactions described above.
In Reaction Scheme 6, protected 10-DAB 3 is converted to the triol 18 with lithium aluminum hydride. . Triol 18 is then converted to the corresponding C4 ester using Cl2CO in pyridine followed by a nucleophilic agent (e.g., Grignard reagents or alkyllithium reagents).
Scheme 6
20 19
Deprotonation of triol 18 with LDA followed by 5 introduction of an acid chloride selectively gives the C4 ester. For example, when acetyl chloride was used, triol 18 was converted to 1,2 diol 4 as set forth in Reaction Scheme 7.
Triol 18 can also readily be converted to the 10 1,2 carbonate 19. Acetylation of carbonate 19 under vigorous standard conditions provides carbonate 21 as described in Reaction Scheme 8; addition of alkyllithiums or Grignard reagents to carbonate 19 provides the C2 ester having a free hydrcδyl group at C4 as set forth in 15 Reaction Scheme 6.
SUBSTITUTE SHEET
Scheme 7
Scheme 8
TM
ACgO
DMAP
TMSOlll
5 As set forth in Reaction Scheme 9, other C4 substituents can be provided by reacting carbonate 19
SUB
with an acid chloride and a tertiary amine to yield carbonate 22 which is then reacted with alkyllithiums or Grignard reagents to provide 10-DAB derivatives having new substituents at C2 .
Scheme 9
2 3 22
Alternatively, baccatin III may be used as a starting material and reacted as shown in Reaction Scheme 10. After being protected at C7 and C13, baccatin III is
10 reduced with LAH to produce 1,2,4,10 tetraol 24. Tetraol 24 is converted to carbonate 25 using Cl2CO and pyridine, and carbonate 25 is acylated at CIO with an acid chloride and pyridine to produce carbonate 26 (as shown) or with acetic anhydride and pyridine (not shown) . Acetylation
15 of carbonate 26 under vigorous standard conditions provides carbonate 27 which is then reacted with alkyl
S
lithiums to provide the baccatin III derivatives having new substituents at C2 and CIO.
Scheme 10
LAH
TMSOll
TMSOl
SUBSTITUTE SHEET
10-desacetoxy derivatives of baccatin III and 10-desoxy derivatives of 10-DAB may be prepared by reacting baccatin III or 10-DAB (or their derivatives) with samarium diiodide. Reaction between the tetracyclic taxane having a CIO leaving group and samarium diiodide may be carried out at 0°C in a solvent such as tetrahydrofuran. Advantageously, the samarium diiodide selectively abstracts the CIO leaving group; C13 side 0 chains and other substituents on the tetracyclic nucleus remain undisturbed. Thereafter, the C9 keto substituent may be reduced to provide the corresponding 9-desoxo-9β- hydroxy-10-desacetyoxy or 10-desoxy derivatives as otherwise described herein. 5 C7 dihydro and other C7 substituted taxanes can be prepared as set forth in Reaction Schemes 11, 12 and 12a.
SUBSTITUTE SHEET
REACTION SCHEME 11
REACTION SCHEME 12
SUBSTITUTE SHEE
REACTION SCHEME 12a
T
As shown in Reaction Scheme 12, Baccatin III may be converted into 7-fluoro baccatin III by treatment with FAR at room temperature in THF solution. Other baccatin derivatives with a free C7 hydroxyl group behave similarly. Alternatively, 7-chloro baccatin III can be prepared by treatment of baccatin III with methane sulfonyl chloride and triethylamine in methylene chloride solution containing an excess of triethylamine hydrochloride.
Taxanes having C7 acyloxy substituents can be prepared as set forth in Reaction Scheme 12a, 7,13- protected 10-oxo-derivative 11 is converted to its corresponding C13 alkoxide by selectively removing the C13 protecting group and replacing it with a metal such as lithium. The alkoxide is then reacted with a β-lactam or other side chain precursor. Subsequent hydrolysis of the C7 protecting groups causes a migration of the C7 hydroxy substituent to CIO, migration of the CIO oxo substituent to C9, and migration of the C9 acyloxy substituent to C7.
A wide variety of tricyclic taxanes are naturally occurring, and through manipulations analogous to those described herein, 'an appropriate side chain can be attached to the C13 oxygen of these substances. Alternatively, as shown in Reaction Scheme 13, 7-0- triethylsilyl baccatin III can be converted to a tricyclic taxane through the action of trimethyloxonium tetrafluoroborate in methylene chloride solution. The product diol then reacts with lead tetraacetate to provide the corresponding C4 ketone.
SUBSTITUTE SHEET
REACTION SCHEME 13
Pb C OAc D 4
Recently a hydroxylated taxane (14-hydroxy-10- deacetylbaccatin III) has been discovered in an extract of yew needles (C&EN, p 36-37, April 12, 1993). Derivatives of this hydroxylated taxane having the various C2, C4, etc. functional groups described above may also be prepared by using this hydroxylated taxane. In addition, the C14 hydroxy group together with the Cl hydroxy group of 10-DAB can be converted to a 1,2- carbonate as described in C&EN or it may be converted to a variety of esters or other functional groups as otherwise described herein in connection with the C2, C4, C9 and CIO substituents.
The following examples are provided to more fully illustrate the invention.
SUBSTITUTE SHEET
EXAMPLE 1
( 29 -4 )
Preparation of 3'-desphenyl-3'- (2-methyl-1-propenyl) taxol.
To a solution of 7-triethylsilyl baccatin III (120 mg, 0.171 mmol) in 1.2 mL of THF at -45 oc was added dropwise 0.104 mL of a 1.63M solution of nBuLi in hexane. After 0.5 h at -45 °C, a solution of cis-l-benzoyl-3-tri- ethylsilyloxy-4-(2-methyl-l-propenyl)azetidin-2-one (295 mg, 0.885 mmol) in 1.2 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 179 mg of a mixture containing (2'R,3'S)- 2' ,7- (bis)triethylsilyl-3'-desphenyl-3'-(2-methyl- 1-propenyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 179 mg (0.171 mmol) of the mixture obtained from the previous reaction in 11 mL of acetonitrile and 0.55 mL of pyridine at 0 oc was added 1.7 mL of 48% aqueous HF. The mixture was stirred at 0 oc for 3 h, then at 25 °C for 13 h, and partitioned between saturated aqueous sodium bicarbonate and ethyl
SUBSTITUTESHEET
acetate. Evaporation of the ethyl acetate solution gave 140 mg of material which was purified by flash chromatography to give 109.0 mg (78%) of 3 ' -desphenyl- 3 ' - (2-methyl-1-propenyl) taxol, which was recrystallized from methanol/water.
m.p.143-144 oc; [α]25 Na-61.0° (c 0.0065, CHC13) .
-E NMR (CDC13, 300 MHz) δ 8.11 (d, J=7.1 Hz, 2H, benzoate ortho) ,7.69 (d, J=8.3 Hz, 2H, benzamide ortho) , 7.64-7.36 ( , 6H, aromatic), 6.45(d, J=8.2 Hz, IH, NH) , 6.29 (s, IH, H10), 6.20 (dd, J = 7.7, 7.7 Hz, IH, H13), 5.68(d, J = 7.1 Hz, IH, H2β) , 5.46 (m, IH, vinyl), 5.27 (ddd, J=8.8, 8.8, 3.3 Hz, IH, H3 ' ) , 4.96 (d, J = 7.7 Hz, IH, H5) , 4.40 (m, IH, H7),4.36(m, IH, H2 ' ) , 4.32(d, J= 7.8 Hz, IH, H20α) , 4.22 (d, J=7.8 Hz, IH, H20E) , 3.82(d, J= 7.1 Hz, IH, H3), 3.63 (d, J= 6.6 Hz, IH, 2 OH), 2.54(m, IH, H6α) , 2.48(d, J=3.9 Hz, IH, 70H) , 2.42(m, 2H, H14), 2.39(s, 3H, 4Ac),, 2.23 (s, 3H, lOAc) , 2.16(br s, 3H, Mel8), 1.89 (m, IH, H6β) , 1.88 (s, 3H, Mel9), 1.80(s, 4H, Me thienyl+lOH) , 1.24 (s, 3H, Mel7), 1.14 (s, 3H, Mel6) .
EXAMPLE 2
(51-3)
Preparation of 3 '-desphenyl-3'-isobutenyl-N-debenzoyl- N- (t-butoxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (30.0 mg, 0.043 mmol) in 0.5 mL of THF at -45 °C was added dropwise 0.047 mL of a 1.0 M solution of (TMS)2NLi in THF. After 0.5 h at -45 °C, a solution of cis-1- (t-butoxy- carbonyl) -3- (2-methoxy-2-propoxy) -4-isobutenylazetidin-2- one (44.2 g, 0.13 mmol) in 0.4 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 40.3 mg of a mixture containing (2'R,3'S) - 2'-(2-methoxy-2-propoxy) -3'-desphenyl-3'- isobutenyl-7-triethylsilyl-N-debenzoyl-N-(t-butoxy- carbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 40.3 mg (0.038 mmol) of the mixture obtained from the previous reaction in 2 mL of acetonitrile and 0.1 mL of pyridine at 0 °C was added 0.3 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
SUBSTITUTE SHEET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 34.2 mg of material which was purified by flash chromatography to give 22.4 mg (72%) of 3'-desphenyl-3 '-isobutenyl-N- debenzoyl-N- (t-butoxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l47-149°C; [α]»Na-65.2° (c 0.0023, CHC1,) .
αH NMR (CDC13, 300 MHz) δ 8.11 (d, J=7.1 Hz, 2H, benzoate ortho), 7.61 (m, IH, benzoate para), 7.48 (m, 2H, benzoate meta) , 6.45(s, IH, NH) , 6.30(d, J= 8.3 Hz, IH, H10),
6.18 (dd, J" = 7.7, 7.7 Hz, IH, Hi3) , 5.68 (d, J = 7.1 Hz, IH, H2β) , 5.31 (m, IH, vinyl), 5.01 (ddd, J=8.8, 8.8, 3.3 Hz, IH, H3'), 4.95 (d, J = 7.7 Hz, IH, H5) , 4.76(m, IH, H7),4.43(m, IH, H2' ) , 4.32(d, J= 7.8 Hz, IH, H20α) , 4.19 (d, J=7.8 Hz, IH, H20β), 3.81(d, J= 7.1 Hz, IH, H3) ,
3.74(d, J= 6.6 Hz, IH, 2'OH), 2.54(m, IH, H6α) , 2.48(d, J=3.9 Hz, IH, 70H) , 2.44 (m, 2H, H14) , 2.39(s, 3H, 4Ac) , 2.26(s, 3H, Me vinyl), 2.25(s, 3H, Me vinyl), 2.23 (s, 3H, lOAc), 1.98 (br s, 3H, Mel8) , 1.86 (m, IH, H6β) , 1.76 (s, 3H, Mel9), 1.43(s, 9H, 3Me t-butoxy) 1.25(s, 3H, Mel7) , 1.14(s, 3H, Mel6) .
SUBSTITUTE SHEET
EXAMPLE 3
(54-1)
Preparation of N-debenzoyl-N-(n-butoxycarbonyl) -3'- desphenyl-3 '-isobutenyl taxol.
To a solution of 7-triethylsilyl baccatin III (70.0 mg, 0.086 mmol) in 0.7 mL of THF at -45°C was added dropwise 0.10 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45°C, a solution of cis-1- (n-butoxycarbonyl) -3-(2-methoxy-2-propoxy)-4-isobutenyl- azetidin-2-one (94.2mg, 0.214 mmol) in 0.5 mL of THF was added dropwise to the mixture. The solution was warmed to 0°C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 82.8 mg of a mixture containing (2'R,3'S) -2'-(2-methoxy-2-propoxy) -7-triethylsilyl- N-debenzoyl-N-(n-butoxycarbonyl) -3'-desphenyl-3 '-iso¬ butenyl taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 82.8 mg (0.083 mmol) of the mixture obtained from the previous reaction in 6.0 mL of acetonitrile and 0.3 mL of pyridine at 0°C was added 0.7 mL of 48% aqueous HF. The mixture was stirred at 0°C for 3 h, then at 25°C for 13 h, and partitioned between saturated aqueous sodium bicarbonate and ethyl acetate.
SUBSTITUTE SHEET
Evaporation of the ethyl acetate solution gave 67.7 mg of material which was purified by flash chromatography to give 53.2 mg (77%) of N-debenzoyl-N- (n-butoxycarbonyl) - 3 ' -desphenyl-3 ' -isobutenyl taxol, which was recrystallized from methanol/water.
m.p.l32-134°C; [α]» Na -64.0° (c 0.0023, CHC1,) .
Η NMR (CDC13, 300 MHz) δ 8.11(d, J=7.2 Hz, 2H, benzoate ortho), 7.61 (m, IH, benzoate para), 7.48 (m, 2H, benzoate meta), 6.30(s, IH, H10), 6.21(dd, J = 7.5, 7.5 Hz, IH, H13), 5.67(d, J = 7.2 Hz, IH, H2β) , 5.33(m, IH, olefine of isobutenyl), 4.97(d, J= ,7.8, IH, H5), 4.91(d, J=8.2 Hz, IH, NH) , 4.78(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.43(m, IH, H2 ' ) , 4.31(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7), 4.16(d, J=7.8 Hz, IH, H20β) , 3.96(q, J=6.6 Hz, 2H, n-butyloxy), 3.81(d, J= 7.2 Hz, IH, H3) , 3.34(d, J= 6.6 Hz, IH, 2'OH), 2.54(m, IH, H6α) , 2.50(d, J=3.9 Hz,
IH, 70H) , 2.36(s, 3H, 4Ac) , 2.33(m, 2H, H14), 2.26(s, 3H, lOAc), 2.24(br s, 3H, Mel8) , 1.89(s, 3H, Mel9), 1.87 (m, IH, H6β) , 1.77 (s, 3H, Me isobutenyl), 1.75 (s, IH, 10H) , 1.68 (s, 3H, Me isobutenyl), 1.56 (m, 2H, n-butyloxy) ,
1.32 (m, 2H, n-butyloxy), 1.26(s, 3H, Mel7) , 1.15(s, 3H, Mel6), 0.85 (t, J=6.6 Hz, 3H, Me of n-butyloxy) .
SUBS
EXAMPLE 4
(54-2)
Preparation of 3'-desphenyl-3'-isobutenyl-N-debenzoyl- N- (isobutyloxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (40.0 mg, 0.042 mmol) in 0.5 mL of THF at -45°C was added dropwise 0.05 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1- (isobutyloxycarbonyl) -3-(2-methoxy-2-propoxy) - 4-iso- butenylazetidin-2-one (43.0 mg, 0.13 mmol) in 0.5 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 0.5 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 31.2 mg of a mixture containing (2'R,3'S)-2'-(2methoxy-2-propoxy) - 7-triethylsilyl-3'-desphenyl-3'-isobutenyl-N-debenzoyl-N- (isobutyloxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 31.2 mg (0.030 mmol) of the mixture obtained from the previous reaction in 2.0 mL of acetonitrile and 0.12 mL of pyridine at 0 °C was added
0.25 mL of 48% aqueous HF. The mixture was stirred at 0°C for 3 h, then at 25 °C for 13 h, and partitioned between
SUBSTITUTE SHEET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 27.7 mg of material which was purified by flash chromatography to give 20.7 mg (83%) of 3 ' -desphenyl-3 ' -isobutenyl-N- debenzoyl-N- (isobutyloxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l47-148°C; [α]»Na -58.2° (c 0.0016, CHC1,) .
XH NMR (CDC13, 300 MHz) δ 8.11(d, J=7.2 Hz, 2H, benzoate ortho), 7.61(m, IH, benzoate para) , 7.50 (m, 2H, benzoate meta) , 6.30(s, IH, H10), 6.22(dd, J = 7.5, 7.5 Hz, IH, H13), 5.65(d, J = 7.2 Hz, IH, H2β) , 5.31(m, IH, define of isobuthenyl) , 4.95 (d, J= 7.8, IH, H5), 4.91 (d, J=8.2 Hz, IH, NH) , 4.76(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.41(m, IH, H2 ' ) , 4.33(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7), 4.16(d, J=7.8 Hz, IH, H20β) , 3.81(d, J= 7.2 Hz, IH, H3), 3.71(dd, J=10.2, 6.6 Hz, IH, isobuthyl), 3.60(dd, J=10.2, 6.6 Hz, IH, isobuthyl), 3.31(d, J= 6.6 Hz, IH, 2'OH), 2.55(m, IH, H6α) , 2.50(d, J=3.9 Hz, IH,
70H) , 2.37(s, 3H, 4Ac) , 2.31(m, 2H, H14), 2.26(s, 3H, lOAc), 2.23(br s, 3H, Mel8) , 1.89(s, 3H, Mel9), 1.87 (m, IH, H6β) , 1.77 (s, 3H, Me isobuthenyl), 1.75 (s, IH, 10H) , 1.66 (s, 3H, Me isobuthenyl), 1.25 (s, 3H, Mel7), 1.15 (s, 3H, Mel6), 0.76(d, J=7.2 Hz, 3H, Me of isobuthyl), 0.70(d, J=6.6 Hz, 3H, Me of isobuthyl) .
SUBSTITUTESHEET
EXAMPLE 5
(54-3)
Preparation of 3'-desphenyl-3'-isobutenyl-N-debenzoyl-N- (ethoxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (100.0 mg, 0.142 mmol) in 1.0 mL of THF at -45°C was added dropwise 0.16 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1- (ethoxycarbonyl) -3-(2 ' -2 " -(2-methoxy-2-propoxy) -4-isobute nyl-azetidin-2-one (155 mg, 0.43 mmol) in 1.0 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 112.2 mg of a mixture containing (2'R,3'S) -2'-(2-methoxy-2-propoxy) - 3'-desphenyl-3'-isobutenyl-7-triethylsilyl-N-debenzoyl-N- (ethoxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 112.2 mg (0.109 mmol) of the mixture obtained from the previous reaction in 7.0 mL of acetonitrile and 0.4 mL of pyridine at 0 °C was added 0.9 mL of 48% aqueous HF. Thfe mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
SUBSTITUTESHEET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 98.7 mg of material which was purified by flash chromatography to give 81.4 mg (93%) of 3 '-desphenyl-3 '-isobutenyl-N- debenzoyl-N- (ethoxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l37-140°C; [α]» Na -56.2.0° (c 0.0023, CHC1,) .
-Η. NMR (CDC13, 300 MHz) δ 8.11(d, J=7.2 Hz, 2H, benzoate ortho), 7.61(m, IH, benzoate para), 7.50 (m, 2H, benzoate meta) , 6.30(s, IH, H10), 6.19(dd, J = 7.5, 7.5 Hz, IH, H13), 5.65(d, J = 7.2 Hz, IH, H2β) , 5.31(m, IH, olefine of isobuthenyl), 4.98(d, J= 7.8, IH, H5) , 4.90(d, J=8.2 Hz, IH, NH) , 4.75(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.45(m, IH, H2 ' ) , 4.31(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7), 4.16(d, J=7.8 Hz, IH, H20β) , 3.93(q, J=7.2 Hz, 2H, ethyl), 3.81(d, J= 7.2 Hz, IH, H3) , 3.34(d, J= 6.6 Hz, IH, 2'OH), 2.54(m, IH, H6α) , 2.50(d, J=3.9 Hz, IH, 70H) , 2.36(s, 3H, 4Ac) , 2.33(m, 2H, H14), 2.26(s, 3H, lOAc), 2.24(br s, 3H, Mel8), 1.89(s, 3H, Mel9), 1.87 (m, IH, H6β) , 1.78 (s, 3H, Me isobuthenyl), 1.73 (s, IH, lOH) , 1.68(s, 3H, Me isobuthenyl), 1.26(s, 3H, Mel7), 1.15(s, 3H, Mel6), 1.08(t, J=7.2 Hz, 3H, Me of ethyl) .
SUBSTITUTE SHEET
EXAMPLE 6
( 58-3 )
Preparation of 3'-desphenyl-3'-isobutenyl-N-debenzoyl- N- (neopentyloxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (50.0 mg, 0.071 mmol) in 0.7 mL of THF at -45 °C was added dropwise 0.08 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1- (neopentyloxycarbonyl) -3-(2-methoxy-2-propoxy) -4-iso- buthenylazetidin-2-one (68.9 mg, 0.21 mmol) in 1.0 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 65.1 mg of a mixture containing (2'R,3 ' S ) -2'- (2-methoxy-2-propoxy) -3'- desphenyl-3'-isobutenyl-7-triethylsilyl-N-debenzoyl-N- (neopentyloxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 65.1 mg (0.057 mmol) of the mixture obtained from the previous reaction in 6.0 mL of acetonitrile and 0.3 mL of pyridine at 0 °C was added 0.7 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
SUBSTITUTE SHEET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 58.2 mg of material which was purified by flash chromatography to give 31.2 mg (65%) of 3'-desphenyl-3'-(isobutenyl) -N- debenzoyl-N- (neopentyloxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l47-149°C; [α]»Na-58.5° (c 0.0019, CHC13) .
Η NMR (CDC1,, 300 MHz) δ 8.15 (d, J=7.2 Hz, 2H, benzoate ortho), 7.61 (m, IH, benzoate para), 7.50 (m, 2H, benzoate meta) , 6.30(s, IH, H10), 6.22(dd, J = 7.5, 7.5 Hz, IH, H13), 5.68(d, J = 7.2 Hz, IH, H2β) , 5.32 (m, IH, define of isobuthenyl), 4.98(d, J= 7.8, IH, H5) , 4.89(d, J=8.2 Hz, IH, NH) , 4.76(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.43 (m, IH, H2 ' ) , 4.29(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7), 4.16(d, J=7.8 Hz, IH, H20β) , 3.76(s, 2H, neopenthyloxy) , 3.81(d, J= 7.2 Hz, IH, H3) , 3.34(d, J= 6.6 Hz, IH, 2'OH), 2.55(m, IH, H6α) , 2.50(d, J=3.9 Hz, IH, 70H) , 2.33(s, 3H, 4Ac) , 2.30(m, 2H, H14) , 2.26(s, 3H, lOAc) , 2.24(br s, 3H, Mel8), 1.89(s, 3H, Mel9), 1.87 (m, IH, H6β) , 1.77(s, 3H, Me isobuthenyl), 1.75(s, IH, lOH) , 1.68 (s, 3H, Me isobuthenyl), 1.26 (s, 3H, Mel7), 1.20 (s, 9H, Me of neopenthyloxy) 1.15(s, 3H, Mel6) .
SUBSTITUTESHEET
EXAMPLE 7
( 58-4 )
Preparation of 3'-desphenyl-3'-isobutenyl-N-debenzoyl- N- (isopropyloxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (50.0 mg, 0.071 mmol) in 0.7 mL of THF at -45 °C was added dropwise 0.08 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1- (isopropyloxycarbonyl) -3- (2-methoxy-2-propoxy) -
4-isobutenylazetidin-2-one (56.3 mg, 0.22 mmol) in 1.0 mL of THF was added dropwise to the mixture. The solution was warmed to 0°C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous
NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 63.4 mg of a mixture containing (2'R,3'S) -2'-(2-methoxy-2-propoxy) - 3'-desphenyl-3'-isobutenyl-7-triethylsilyl-N-debenzoyl-N- (isopropyloxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 63.4 mg (0.057 mmol) of the mixture obtained from the previous reaction in 5.5 mL of acetonitrile and 0.3 mL of pyridine at 0 °C was added 0.66 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
ET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 49.2 mg of material which was purified by flash chromatography to give 38.2 mg (82%) of 3 ' -desphenyl-3 ' -isobutenyl-N- debenzoyl-N- (isopropyloxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l45-147°C; [α]» Na -58.3° (c 0.0019, CHCl,) .
lH NMR (CDC1,, 300 MHz) δ 8.12 (d, J=7.2 Hz, 2H, benzoate ortho), 7.61 (m, IH, . benzoate para), 7.50 (m, 2H, benzoate meta) , 6.30(s, IH, H10), 6.20(dd, J = 7.5, 7.5 Hz, IH,
H13), 5.65(d, J = 7.2 Hz, IH, H2β) , 5.31(m, IH, define of isobuthenyl), 4.96{d, J= 7.8, IH, H5), 4.90(d, J=8.2 Hz, IH, NH) , 4.77(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.69 ( , IH, isopropyloxy) , 4.43 (m, IH, H2 ' ) , 4.31 (d, J=7.8 Hz, IH, H20α) , 4.24(m, IH, H7) , 4.15(d, J=7.8 Hz, IH, H20β) , 3.81(d, J= 7.2 Hz, IH, H3) , 3.33(d, J= 6.6 Hz, IH, 2'OH), 2.54(m, IH, H6α) , 2.50 (d, J=3.9 Hz, IH, 70H) ,
2.34(s, 3H, 4Ac), 2.30(m, 2H, H14), 2.24(s, 3H, lOAc) , 2.21(br s, 3H, Mel8) , 1.88(s, 3H, Mel9), 1.87 (m, IH, H6β) , 1.77 (s, 3H, Me isobuthenyl), 1.75 (s, IH, lOH) ,
1.66(s, 3H, Me isobuthenyl), 1.25 (s, 3H, Mel7), 1.16 (s, 3H, Mel6), 1.14 (d, J=6.6Hz, 3H, Me of isopropyloxy), 1.12(d, J=6.6 Hz, 3H, Me of isopropyloxy) .
SUBSTITUTE SHEET
EXAMPLE 8
( 59 -1 )
Preparation of 3'-desphenyl-3 '-isobutenyl-N-debenzoyl- N- (allyloxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (50.0 mg, 0.071 mmol) in 0.7 mL of THF at -45 °C was added dropwise 0.08 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-l-(allyloxycarbonyl) -3-(2-methoxy-2-propoxy) -
4-isobutenylazetidin-2-one (65.4 mg, 0.22 mmol) in 1.0 mL of THF was added dropwise to the mixture. The solution was warmed to 0°C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous
NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 64.4 mg of a mixture containing (2'R,3'S) -2'-(2-methoxy-2-propoxy) - 3'-desphenyl-3'-isobuthenyl-7-triethylsilyl-N-debenzoyl- N-(allyloxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 64.4 mg (0.058 mmol) of the mixture obtained from the previous reaction in 6.0 mL of acetonitrile and 0.28 mL of pyridine at 0 °C was added 0.7 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 53.2 mg of material which was purified by flash chromatography to give 33.3 mg (71%) of 3 ' -desphenyl-3 ' -isobutenyl-N- debenzoyl-N- (allyloxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l37-139°C; [α]» Na -59.1° (c 0.0022, CHC13) .
Η NMR (CDC13, 300 MHz) δ 8.11 (d, J=7.2 Hz, 2H, benzoate ortho), 7.60 (m, IH, benzoate para), 7.50 (m, 2H, benzoate meta) , 6.29(s, IH, H10), 6.21(dd, J = 7.5, 7.5 Hz, IH, H13), 5.78(m, IH, allyl), 5.67(d, J = 7.2 Hz, IH, H2β) , 5.33 (m, IH, olefine of isobuthenyl), 5.14 (m, 2H, allyl), 4.97(d, J= 7.8, IH, H5) , 4.91(d, J=8.2 Hz, IH, NH) , 4.78(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.43 (m, IH, H2 ' ) , 4.31(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7) , 4.18(d,
J=7.8 Hz, IH, H20β) , 4.08(d, J=6.6 Hz, 2H, allyl) 3.79(d, J= 7.2 Hz, IH, H3), 3.34(d, J= 6.6 Hz, IH, 2'OH), 2.55(m, IH, H6α) , 2.50(d, J=3.9 Hz, IH, 70H) , 2.36(s, 3H, 4Ac), 2.33(m, 2H, H14), 2.26(s, 3H, lOAc) , 2.24(br s, 3H, Mel8), 1.88(s, 3H, Mel9), 1.85(m, IH, H6β) , 1.72(s, 3H, Me isobuthenyl), 1.69 (s, IH, lOH) , 1.61(s, 3H, Me isobuthenyl), 1.25 (s, 3H, Mel7), 1.15 (s, 3H, Mel6) .
SUBSTITUTE SHEET
EXAMPLE 9
( 59 -2 )
Preparation of 3'-desphenyl-3'-isobutenyl-N-debenzoyl- N- (benzoyloxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (50.0 mg, 0.071 mmol) in 0.7 mL of THF at -4°C was added dropwise 0.08 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -4°C, a solution of cis-1- (benzoyloxycarbonyl) -3-(2-methoxy-2-propoxy) -4-iso- butenylazetidin-2-one (63 mg, 0.21 mmol) in 0.5 mL of THF was added dropwise to the mixture. The solution was warmed to 0°C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 60.4 mg of a mixture containing (2'R,3'S) -2'- (2-methoxy-2-propoxy) - 3'-desphenyl-3'-isobutenyl-7-triethylsilyl-N-debenzoyl-N- (benzoyloxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 60.4 mg (0.053 mmol) of the mixture obtained from the previous reaction in 5.0 mL of acetonitrile and 0.3 mL of pyridine at 0 °C was added 0.65 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
SUBSTITUTE SHEET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 48.2 mg of material which was purified by flash chromatography to give 34.1 mg (74%) of 3'-desphenyl-3'-isobutenyl-N- debenzoyl-N-(benzoyloxycarbonyl) taxol, which was recrystallized from methanol/water.
m.p.l48-149°C; [α]» Na -53.2.0° (c 0.0026, CHC13) .
Η NMR (CDC1,, 300 MHz) δ 8.15(d, J=7.2 Hz, 2H, benzoate ortho), 7.61 (m, IH, benzoate para), 7.48(m, 2H, benzoate meta) , 7.22-7.20 (m, 3H, benzyl), 7.10-7.05(m, 2H, benzyl), 6.29(s, IH, H10), 6.21{dd, J = 7.5, 7.5 Hz, IH, H13), 5.63 (d, J = 7.2 Hz, IH, H2b) , 5.33 (m, IH, olefine of isobuthenyl), 5.06(d, J=12.3 Hz, IH, benzyl), 4.97 (d, J= 7.8, IH, H5), 4.91{d, J=8.2 Hz, IH, NH) , 4.85(d, J=12.3 Hz, IH, benzyl), 4.76(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3'), 4.48(m, IH, H2 ' ) , 4.30(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7) , 4.16(d, J=7.8 Hz, IH, H20β) , 3.81(d, J= 7.2 Hz, IH, H3), 3.34(d, J= 6.6 Hz, IH, 2OH), 2.55(m, IH, H6α) , 2.49 (d, J=3.9 Hz, IH, 70H) , 2.36 (s, 3H, 4Ac) , 2.32 ( , 2H, H14) , 2.27(s, 3H, lOAc) , 2.24(br s, 3H,
Mel8), 1.90(s, 3H, Mel9) , 1.86(m, IH, H6β) , 1.77(s, 3H, Me isobuthenyl), 1.75(s, IH, lOH) , 1.67 (s, 3H, Me isobuthenyl), 1.27 (s, 3H, Mel7), 1.16 (s, 3H, Mel6) .
SUBSTITUTESHEE
EXAMPLE 10
(60-3)
Preparation of 3'-desphenyl-3'-isobutenyl-N-debenzoyl- N- (trimethylsilylmethoxycarbonyl) taxol.
To a solution of 7-triethylsilyl baccatin III (50.0 mg, 0.71 mmol) in 0.7 mL of THF at -45 °C was added dropwise 0.08 mL of a 1.0 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1- (trimethylsilylmethoxycarbonyl)-3- (2-methoxy-2-propoxy) - 4- (isobuthenyl)azetidin-2-one (77.0 mg, 0.22 mmol) in 0.7 mL of THF was added dropwise to the mixture. The solution was warmed to 0°C and kept at that temperature for 1 h before 1.0 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous
NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 58.4 mg of a mixture containing (2'R,3'S)-2'-(2-methoxy-2-propoxy) - 3 '-desphenyl-3'-isobutenyl-7-triethylsilyl-N-debenzoyl-N- (trimethylsilylmethoxycarbonyl) taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 58.4 mg (0.51 mmol) of the mixture obtained from the previous reaction in 5.0 mL of acetonitrile and 0.30 mL of pyridine at 0 °C was added
0.60 mL of 48% aqueous HP. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned
SUBSTITUTE SHEET
between saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 51.2 mg of material which was purified by flash chromatography to give 31.1 mg (71%) of 3 ' -desphenyl- 3 ' -isobutenyl-N-debenzoyl-N- (trimethylsilylmethoxy- carbonyl) taxol, which was recrystallized from methanol/water.
m.p.l49-151°C; [α]» Na -58.0° (c 0.0018, CHC13) .
Η NMR (CDC1,, 300 MHz) δ 8.11 (d, J=7.2 Hz, 2H, benzoate ortho), 7.61 (m, IH, benzoate para), 7.48 (m, 2H, benzoate meta) , 6.30(s, IH, H10), 6.21(dd, J = 7.5, 7.5 Hz, IH, H13), 5.67 (d, J = 7.2 Hz, IH, H2β) , 5.33 (m, IH, olefine of isobuthenyl), 4.97 (d, J= 7.8, IH, H5), 4.88 (d, J=8.2 Hz, IH, NH) , 4.76(ddd, J=8.7, 8.7, 2.7 Hz, IH, H3 ' ) , 4.41(m, IH, H2 ' ) , 4.28(d, J=7.8 Hz, IH, H20α) , 4.25(m, IH, H7), 4.16(d, J=7.8 Hz, IH, H20β) , 3.76(d, J= 7.2 Hz, IH, H3), 3.68(d, J=14.1 Hz, IH, CH^TMS) , 3.51(d, J=14.1 Hz, IH, O^TMS), 3.41 (d, J= 6.6 Hz, IH, 2 OH), 2.55{m, IH, H6α) , 2.50 (d, J=3.9 Hz, IH, 70H) , 2.29 (s, 3H, 4Ac) , 2.25(m, 2H, H14), 2.21(s, 3H, lOAc) , 2.24(br s, 3H,
Mel8), 1.89(s, 3H, Mel9), 1.87 (m, IH, H6β) , 1.77(s, 3H, Me isobuthenyl), 1.75 (s, IH, lOH) , 1.68 (s, 3H, Me isobuthenyl), 1.18 (s, 3H, Mel7) , 1.15 (s, 3H, Mel6) , -0.04(s, 9H, Me3Si-) .
EXAMPLE 11
( 70-4 )
Preparation of 3 ' -desphenyl-3 ' - ( isobutenyl ) -N-desbenzoyl- N- ( t-butoxycarbonyl ) -9-desoxo-9β-hydroxy-10-desacetyl taxol .
To a solution of 7,10-(bis) -O-triethylsilyl-9- desoxo-9β-hydroxy-10-deacetyl baccatin (III) (70.0 mg,
0.09 mmol) in 1.0 mL of THF at -45 °C was added dropwise 0.10 mL of a 0.98 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1- (t-butoxy¬ carbonyl) -3-(2-methoxyisopropyloxy) -4-(isobutenyl) - azetidin-2-one (84.5 mg, 0.27 mmol) in 1.0 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 88.3 mg of a mixture containing
(2'R,3'S) -2' ,7,10-(tris) -O-triethylsilyl-3'-desphenyl- 3'- (isobutenyl) -N-desbenzoyl-N-(t-butoxycarbonyl) - 9-desoxo-9β-hydroxy-10-desacetyl taxol and a small amount of the (2'S,3'R) isomer. To a solution of 88.3 mg (0.080 mmol) of the mixture obtained from the previous reaction in 13.5 mL of acetonitrile and 0.55 mL of pyridine at 0 °C was added 1.90 mL of 48% aqueous HF. The mixture was stirred at 0
SUBSTITUTE SHEET
°C for 3 h, then at 25 °C for 13 h, and partitioned between saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 67.2 mg of material which was purified by flash chromatography to give 52.7 mg (82%) of 3 ' -desphenyl- 3 ' - (isobutenyl) -N-desbenzoyl-N- (t-butoxycarbonyl) -9- desoxo-9β-hydroxy-10-desacetyl taxol, which was recrystallized from methanol/water.
m.p.l38-140°C; [α]»κa -55.2° (c 0.0026, CHC1,) .
lH NMR (MeOH, 300 MHz) δ 8.11(d, J=7.1 Hz, 2H, benzoate ortho), 7.61(m, IH, benzoate para), 7.48 (m, 2H, benzoate meta) , 6.13 ( , IH, H13), 6.12 (m, IH, H2) , 5.21(br s., IH, H3 ' ) , 5.02(d, J=5.3 Hz, IH, H10), 4.93(d, J=8.1 Hz, IH, H5), 4.85(d, J=9.1 hz, IH, NH) , 4.84(d, J=8.5 Hz, IH, Me2C=CH-), 4.50 (br s, IH, H2 ' ) , 4.50 (d, J=5.5 Hz, IH, H9) , 4.22(d, J=8.1, IH, H20α), 4.18(d, J=8.1 Hz, IH, H20β) , 3.89(dd, J=9.4, 7.5 Hz, IH, H7) , 3.12(d, J=5.5 Hz, H3), 2.45 ( , IH, H6α) , 2.31(m, IH, H14α) , 2.29 (s, 3H, 4Ac) , 2.18 (m, IH, Hl4β), 1.85 (ddd, J=15.1, 9.4, 1.2 Hz, H6β) , 1.81(s( 3H, Mel6), 1.76(s, 3H, Mel8), 1.72(s, 6H, 2Me from isobuthenyl) , 1.61(s, 3H, Mel9), 1.39(s, 9H, 3Me t-buthoxy) , 1.26 (s, 3H, Mel7) .
SUBSTITUTE SHEET
EXAMPLE 12
(68-4)
Preparation of 3'-desphenyl-3'- (isobutenyl) -N-desbenzoyl- N-(t-butoxycarbonyl) -10-desacetoxy taxol.
To a solution of 7-O-triethylsilyl-10- desacetoxy baccatin (III) (50.0 mg, 0.077 mmol) in 0.8 mL of THF at -45°C was added dropwise 0.09 mL of a 0.98 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-l-t-butoxycarbonyl-3-(2-methoxyiso- propyloxy) -4-(isobutenyl)azetidin-2-one (58.0 mg, 0.193 mmol) in 0.7 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 62.7 mg of a mixture containing (2'R,3'S) -2'-0- (2-methoxy- isopropyl) -7-0-triethylsilyl-3'-desphenyl-3'-
(isobutenyl) -N-desbenzoyl-N- (t-butoxycarbonyl) -10- desacetoxy taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 62.7 mg (0.059 mmol) of the mixture obtained from the previous reaction in 3.5 mL of acetonitrile and 0.16 mL of pyridine at 0 °C was added 0.55 mL of 48% aqueous HF. The mixture was stirred at 0
SUBSTITUTESHEET
°C for 3 h, then at 25°C for 13 h, and partitioned between saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 51.5 mg of material which was purified by flash chromatography to give 43.0 mg (95%) of 3'-desphenyl-3'- (isobutenyl) -N- desbenzoyl-N-(t-butoxy-carbonyl) -10-desacetoxy taxol, which was recrystallized from methanol/water.
m.p.l53-155°C; [α]» Na -56.3° (c 0.003, CHC1,) .
-K NMR (CDC1,, 300 MHz) δ 8.10 (d, J=7.3 Hz, 2H, benzoate ortho), 7.60 (m, IH, benzoate para), 7.47 (m, 2H, benzoate meta) , 6.15(td, J=8.5, 1.8 Hz, IH, H13), 5.69(d, J=6.9 Hz, IH, H2), 5.32(d, J= 9.2 Hz, IH, NH) , 4.93(dd, J=9.6, 1.8 Hz, IH, H5), 4.82(d, J=8.7 Hz, IH, Me2C=CH-), 4.76{td, J=8.7, 2.7 Hz, IH, H3 ' ) , 4.37(d, J=8.7 Hz, IH, H20α) , 4.22{d, J=8.7 Hz, IH, H20β) , 4.18(d, J=2.7 Hz, IH, H2 ' ) , 4.03(d, J=7.3 Hz, IH, H7) , 3.82(d, J=15.2 Hz, IH, HlOα) , 3.47 (m, IH, 2'OH), 3.41(d, J=6.6 Hz, IH, H3) , 2.60 ( , IH, H6α) , 2.39(m, IH, HlOβ) , 2.37(s, 3H, 4Ac) , 2.18(s, IH, 7 OH), 2.08(m, IH, Hl4α), 1.78(m, IH, H14β), 1.76 (s, 3H, Mel8), 1.74(s, 6H, 2Me from isobuthenyl) , 1.63 (m, IH, H6β),
1.36(s, 9H, 3Me t-buthoxy) 1.26(s, 3H, Mel7), 1.18(s, 3H, Mel9), 1.15(s, 3H, Mel6) .
SUBSTITUTE SHEET
EXAMPLE 13
tB
(74-4)
Preparation of 3'-desphenyl-3'- (isobutenyl) -N-desbenzoyl- N- (t-butoxycarbonyl) -9-desoxo-lO-desacetoxy-lO-keto taxol.
To a solution of 7-O-triethylsilyl-9-desoxo-10- desacetoxy-10-keto baccatin (III) (30.0 mg, 0.047 mmol) in 0.5 mL of THF at -45 °C was added dropwise 0.05 mL of a 0.98 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-l-t-butoxycarbonyl-3-(2- methoxyisopropyloxy) -4- (isobutenyl) azetidin-2-one (44.1 mg, 0.141 mmol) in 0.5 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 40.8 mg of a mixture containing
(2'R,3'S) -2'-0-(2-methoxyisopropyl) -7-O-triethylsilyl- 3'-desphenyl-3'- (isobutenyl) -N-desbenzoyl-N- (t-butoxy¬ carbonyl) -9-desoxo-10-desacetoxy-10-keto taxol and a small amount of the (2'S,3'R) isomer. To a solution of 40.8 mg (0.043 mmol) of .the mixture obtained from the previous reaction in 4 mL of acetonitrile and 0.2 mL of pyridine at 0 °C was added 0.5 mL of 48% aqueous HF. The mixture was stirred at 0 °C for
SUBSTITUTE SHEET
3 h, then at 25 °C for 13 h, and partitioned between saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 34.4 mg of material which was purified by flash chromatography to give 23.0 mg (70%) of 3 '-desphenyl-3 '- (isobutenyl) -N- desbenzoyl-N- (t-butoxycarbonyl) -9-desoxo-10-desacetoxy- 10-keto taxol, which was recrystallized from methanol/water.
m.p.l49-153°C; [α]» Na -56.3° (c 0.0025, CHC1,) .
Η NMR (CDC1,, 300 MHz) δ 8.12 (d, J=7.2 Hz, 2H, benzoate ortho), 7.64 (m, IH, benzoate para), 7.51 (m, 2H, benzoate meta) , 6.12 (t, J=7.5 Hz, IH, H13), 5.95(d, J=6.2 Hz, IH, H2), 5.30(d, J=8.9 Hz, IH, NH) , 4.94(d, J=8.2 Hz, IH, H5), 4.88(d, J=8.9 Hz, IH, Me2C=CH-), 4.79(td, J=8.9, 2.4 Hz, IH, H3 ' ) , 4.34(d, J=8.2 Hz, IH, H20α) , 4.27 (dd,
J=5.5, 2.7 Hz, IH, H2 ' ) , 4.19(d, J=8.2 Hz, IH, H20β) , , 3.73 {m, IH, H7), 3.67 (br s, IH, 2'OH), 3.13(d, J=5.1 Hz, IH, H3), 3.12 (d, J=15.7 Hz, IH, H9α) , 2.90(d, J=15.7 Hz,
IH, H9β) , 2.55(m, IH, H6α), 2.47(m, IH, H14β), 2.32 (s, 3H, 4Ac), 2.28(m, IH, H14α) , 2.04 (br s, IH, 7 OH), 1.88(s, IH, 1 OH), 1.82 (m, IH, H6β), 1.79(s, 3H, Mel8) , 1.76(s, 6H, 2Me from isobuthenyl), 1.57 (s, 3H, Mel6) , 1.47 (s, 3H, Mel9), 1.40 (s, 9H, 3Me t-buthoxy) 1.30 (s, 3H, Mel7) .
SUBSTITUTE SHEET
EXAMPLE 14
( 70 -1 )
Preparation of 3'-desphenyl-3'-(isobutenyl) -N-desbenzoyl- N- (t-butoxycarbonyl) -7-O-acetyl-lO-desacetyl taxol.
To a solution of 7-0-triethylsilyl-9-desoxy-9β- acetoxy-10-desacetoxy-lO-keto baccatin (III) (33.0 mg, 0.047 mmol) in 0.5 mL of THF at -45 °C was added dropwise 0.05 mL of a 0.98 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1-t-butoxy- carbonyl-3-(2-methoxyisopropyloxy) -4-isobutenylazetidin- 2-one (44.1 mg, 0.141 mmol) in 0.5 mL of THF was added dropwise to the mixture. The solution was warmed to 0°C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 41.9 mg of a mixture containing (2'R,3'S)-2'-0-(2-methoxyisopropyl) -7-O-triethyl- silyl-3'-desphenyl-3'-(isobutenyl)-N-desbenzoyl-N-(t- butoxycarbonyl) -9-desoxy-9β-acetoxy-10-desacetoxy-10-keto taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 41.9 mg (0.045 mmol) of the mixture obtained from the previous reaction in 3.5 mL of acetonitrile and 0.15 mL of pyridine at 0 °C was added 0.50 mL of 48% aqueous HF. The mixture was stirred at 0°C
SUBSTITUTE SHEET
for 3 h, then at 25 °C for 13 h, and partitioned between saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 32.4 mg of material which was stirred with 1.0 g of silica gel in 5 mL of methylene chloride at room temperature in 48 hrs. The organic layer was purified by filtration through silica gel to give 26.2 mg (70%) of 3 '-desphenyl- 3'- (isobutenyl)-N-desbenzoyl-N- (t-butoxycarbonyl)-7-0- acetyl-10-desacetyl taxol.
m.p.H36-139°C; [α]»Na-60.2° (c 0.0025, CHC13) .
Η NMR (CDC13, 300 MHz) δ 8.10 (d, J=7.3 Hz, 2H, benzoate ortho), 7.61 (m, IH, benzoate para), 7.48 (m, 2H, benzoate meta) , 6.16(td, J=8.7, 1.8 Hz, IH, H13), 5.68(d, J=6.9 Hz, IH, H2), 5.48(dd, J=10.5, 7.3 Hz, IH, H7) , 5.33(d, J=1.8 Hz, IH, H10), 5.32(d, J= 9.2 Hz, IH, NH) , 4.94(dd, J=9.6, 1.8 Hz, IH, H5), 4.80 (d, J=8.7 Hz, IH, Me2C=CH-), 4.75(td, J=8.7, 2.7 Hz, IH, H3 ' ) , 4.33(d, J=8.7 Hz, IH, H20α) , 4.23{d, J=2.7 Hz, IH, H2 ' ) , 4.22(d, J=8.7 Hz, IH, H20β) , 4.01(d, J=6.9 Hz, IH, H3) , 3.98(d, J=l.8 Hz, IH, 10OH) , 3.68 (m, IH, 2OH), 2.54 (m, IH, H6α) , 2.37(s, 3H, 4Ac) , 2.35 (m, IH, H14α), 2.01(m, IH, H14β), 1.99 (s, 3H, 7Ac), 1.98 (br s, 3H, Mel8) , 1.93 (m, IH, H6β), 1.85(s, 3H, Mel9), 1.77(s, 6H, 2Me from isobuthenyl) , 1.61(s, IH, 70H) , 1.37 (s, 9H, 3Me t-butoxy), 1.23 (s, 3H, Mel7), 1.10(s, 3H, Mel6) .
SUBSTITUTESHEET
EXAMPLE 15
(71-2)
Preparation of 3'-desphenyl-3'- (isobutenyl) -N-desbenzoyl- N- (t-butoxycarbonyl) -7-deshydroxy taxol.
To a solution of 7-deshydroxy baccatin (III) (38.7 mg, 0.063 mmol) in 0.8 mL of THF at -45 °C was added dropwise 0.08 mL of a 0.98 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-1-t-butoxycarbonyl-3-(2-methoxyisopropyloxy) -4-
(isobutenyl)azetidin-2-one (59.0 mg, 0.19 mmol) in 0.8 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous
NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 43.4 mg of a mixture containing (2'R,3 ' S ) -2 '-0- (2-methoxyisopropyl) - 3'-desphenyl-3'-(isobutenyl) -N-desbenzoyl-N-(t-butoxy¬ carbonyl) -7-deshydroxy taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 43.4 mg (0.049 mmol) of the mixture obtained from the previous reaction in 3.5 mL of acetonitrile and 0.15 mL of pyridine at 0 °C was added 0.5 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned between
SUBSTITUTE SHEET
saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 40.2 mg of material which was purified by flash chromatography to give 34.1mg (86%) of 3'-desphenyl-3'- (isobutenyl) -N- desbenzoyl-N-(t-butoxycarbonyl) -7-deshydroxy taxol, which was recrystallized from methanol/water.
m.p.l42-144°C; [α]» Na-53.3° (c 0.0024, CHC1,) .
-K NMR (CDC1,, 300 MHz) δ 8.13 (d, J=7.3 Hz, 2H, benzoate ortho), 7.60 (m, IH, benzoate para), 7.47 (m, 2H, benzoate meta) , 6.41(s, IH, H10), 6.20(dd, J=9.0, 0.9 Hz, IH, H13), 5.67(d, J=7.2 Hz, IH, H2) , 5.39(d, J=6.9 Hz, IH, NH) , 5.32(d, J=9.0 Hz, IH, H3 ' ) , 4.93(dd, J=8.7, 2.1 Hz, IH, H5), 4.81(d, J=8.7 Hz, IH, Me2C=CH-) , 4.61(d, J=3.3 Hz, IH, H2 ' ) , 4.30(d, J=8.1 Hz, IH, H20α) , 4.17(d, J=8.1 Hz, IH, H20β) , 3.75(d, J=6.6 Hz, IH, H3) , 3.41(m, IH, 2'OH), 2.36(s, 3H, 4Ac) , 2.33(m, IH, Hl4α), 2.30(m, IH, Hl4β) , 2.26(m, IH, H6α) , 2.08 (m, IH, H7α) , 1.94(m, IH, H6β) , 1.85(br s, 3H, Mel8) , 1.73 (s, 6H, 2Me from isobuthenyl), 1.70 (s, 3H, Mel9) , 1.66(s, IH, 1 OH) , 1.53 (m, IH, H7β) , 1.41 (s, 9H, 3Me t-buthoxy), 1.25 (s, 3H, Mel6), 1.15(s, 3H, Mel7).
EXAMPLE 16
(72-1)
Preparation of 3'-desphenyl-3'-(isobutenyl) -N-desbenzoyl- N- (t-butoxycarbonyl) -7-deshydroxy-10-desacetoxy taxol.
To a solution of 7-deshydroxy-10-desacetoxy baccatin (III) (28.7 mg, 0.051 mmol) in 0.7 mL of THF at -45°C was added dropwise 0.06 mL of a 0.98 M solution of LiN(SiMe3)2 in hexane. After 0.5 h at -45 °C, a solution of cis-l-t-butoxycarbonyl-3-(2-methoxyisopropyloxy) -4-
(isobutenyl)azetidin-2-one (47.3 mg, 0.15 mmol) in 0.7 mL of THF was added dropwise to the mixture. The solution was warmed to 0 °C and kept at that temperature for 1 h before 1 mL of a 10% solution of AcOH in THF was added. The mixture was partitioned between saturated aqueous
NaHC03 and 60/40 ethyl acetate/hexane. Evaporation of the organic layer gave a residue which was purified by filtration through silica gel to give 40.3 mg of a mixture containing (2'R,3'S) -2'-O-(2-methox iso- propyl) -3'-desphenyl-3'- (isobutenyl) -N-debenzoyl-N- (t- butoxycarbonyl) -7-deshydroxy-10-desacetoxy taxol and a small amount of the (2'S,3'R) isomer.
To a solution of 40.3 mg (0.046 mmol) of the mixture obtained from the previous reaction in 3.2 mL of acetonitrile and 0.15 mL of pyridine at 0 °C was added
0.47 mL of 48% aqueous HF. The mixture was stirred at 0 °C for 3 h, then at 25 °C for 13 h, and partitioned
SUBSTITUTE SHEET
between saturated aqueous sodium bicarbonate and ethyl acetate. Evaporation of the ethyl acetate solution gave 35.2 mg of material which was purified by flash chromatography to give 24.0 mg (70%) of 3 ' -desphenyl- 3 ' - (isobutenyl) -N-debenzoyl-N- (t-butoxycarbonyl) -7- deshydroxy-10-desacetoxy taxol, which was recrystallized from methanol/water.
m.p.l22-125°C; [α]» Na -64.3° (c 0.0025, CHC1,) .
Η NMR (CDC1,, 300 MHz) δ 8.12 (d, J=7.1 Hz, 2H, benzoate ortho) , 7.60 (m, IH, benzoate para) , 7.48 (m, 2H, benzoate meta) , 6.11(td, J=8.1, 1.8 Hz, IH, H13) , 5.68(d, J=6.9 Hz, IH, H2), 5.23(d, J=9.9' Hz, IH, NH) , 5.12(d, J=9.9 Hz, IH, H3 ' ) , 4.96(dd, J=9.1, 2.7 Hz, IH, H5), 4.80(d, J=8.7 Hz, IH, Me2C=CH-), 4.58 (dd, J=5.7, 2.1 Hz, IH, H2 ' ) , 4.30(d, J=8.1, IH, H20α) , 4.19(d, J=8.1 Hz, IH, H20β) ,
3.97(d, J=6.9 Hz, H3), 3.83(d, J=16.5, IH, HlOα) , 3.33(m, IH, HlOβ) , 3.30(m, IH, 2'OH), 2.39(m, IH, H14α) , 2.35(s, 3H, 4Ac), 2.26(m, IH, H14β), 2.19 (m, IH, H6α) , 2.10(m, IH, H7α) , 1.95 (m, IH, H6β) , 1.73(s, 3H, Mel8), 1.69(s, 6H, 2Me from isobuthenyl) , 1.63(s, 3H, Mel9), 1.44(m, IH,
H7β) , 1.39 (br. s, IH, 1 OH), 1.35 (s, 9H, 3Me t-buthoxy), 1.25(s, 3H, Mel6), 1.15(s, 3H, Mel7) .
EXAMPLE 17 Taxanes 29-4, 51-3, 54-1, 54-2, 54-3, 58-3, 58- 4, 59-1, 59-2, 60-3, 70-4, 68-4, 74-4, 70-1, 71-2, and 72-1 of Examples 1 - 16 were evaluated in in vitro cytotoxicity activity against human colon carcinoma cells HCT-116. Cytotoxicity was assessed in HCT116 human colon carcinoma cells by XTT (2, 3-bis (2-methoxy-4-nitro-5- sulfophenyl) -5- [ (phenylamino) carbonyl] -2H-tetrazolium hydroxide) assay (Scudiero et al, "Evaluation of a soluble tetrazolium/formazan assay for cell growth and
SUBSTITUTESHEET
drug sensitivity in culture using human and other tumor cell lines", Cancer Res. 48:4827-4833, 1988). Cells were plated at 4000 cells/well in 96 well microtiter plates and 24 hours later drugs were added and serial diluted. The cells were incubated at 37°C for 72 hours at which time the tetrazolium dye, XTT, was added. A dehydro- genase enzyme in live cells reduces the XTT to a form that absorbs light at 450 nm which can be quantitated spectrophotometrically. The greater the absorbance the greater the number of live cells. The results are expressed as an IC50 which is the drug concentration required to inhibit cell proliferation (i.e. absorbance at 450 nm) to 50% of that of untreated control cells. All compounds had an IC50 of less than 0.1, indicating that they are cytotoxically active.
SUBSTIT
Claims (8)
1. A taxane derivative having the formula
wherein
X: is -OX6, -SX7, or -NX8X9; X2 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl ;
X3 is hydrogen; X4 is butenyl;
X5 is -COX10, -COOX10, -COSX10, -CONX8X10, or -S02Xn;
X6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, hydroxy protecting group, or a functional group which increases the water solubility of the taxane derivative; X7 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or sulfhydryl protecting group;
X8 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl, alkynyl, aryl or heteroaryl; X9 is an amino protecting group;
X10 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl alkynyl, aryl or heteroaryl;
Xn is alkyl, alkenyl, alkynyl, aryl, heteroaryl, -OX10, or -NX8X14;
SUBSTITUTE SHEET X14 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;
R: is hydrogen, hydroxy, protected hydroxy or together with R14 forms a carbonate; R2 is hydrogen, hydroxy, -OCOR31 together with
R2a forms an oxo;
R2a is hydrogen or taken together with R2 forms an oxo or;
R4 is hydrogen, together with R4a forms an oxo, oxirane or methylene, or together with R5a and the carbon atoms to which they are attached form an oxetane ring;
R4a is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cyano, hydroxy, -OCOR30, or together with R4 forms an oxo, oxirane or methylene; R5 is hydrogen or together with R5a forms an oxo;
R5a is hydrogen, hydroxy, protected hydroxy, acyloxy, together with R5 forms an oxo, or together with R4 and the carbon atoms to which they are attached form an oxetane ring;
R6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl, hydroxy, protected hydroxy or together with R6a forms an oxo;
R6a is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl, hydroxy, protected hydroxy or together with R6 forms an oxo;
R7 is hydrogen or together with R7a forms an oxo;
R7a is hydrogen, halogen, protected hydroxy, -OR28, or together with R7 forms an oxo;
R9 is hydrogen or together with R9a forms an oxo;
R9a is hydrogen, hydroxy, protected hydroxy, acyloxy, or together with R9 forms an oxo; R10 is hydrogen or together with R10a forms an oxo;
SUBSTITUTE SHEET R10a is hydrogen, -OCOR29, hydroxy, or protected hydroxy, or together with R10 forms an oxo;
R14 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, hydroxy, protected hydroxy or together with Rx forms a carbonate;
R14a is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;
R28 is hydrogen, acyl, hydroxy protecting group or a functional group which increases the solubility of the taxane derivative; and
R29' R 3o nd R 3ι are independently hydrogen, alkyl, alkenyl, alkynyl, monocyclic aryl or monocyclic heteroaryl.
2. The taxane derivative of claim 1 wherein X5 is -COX10 and X10 is alkoxy.
3. The taxane derivative of claim 1 wherein R14 and R14a are hydrogen;
R10 is hydrogen or together with R10a forms an oxo; R10a is hydrogen, hydroxy, -OCOR29, or together with R10 forms an oxo;
R9 is hydrogen or together with R9a forms an oxo;
R9a is hydrogen, acyloxy or together with R9 forms an oxo;
R7 is hydrogen;
R7a is hydrogen, halogen or -OR28;
R6 and R6a are hydrogen;
R5 is hydrogen; R5a together with R4 and the carbon atoms to which they are attached form an oxetane ring;
R4a is hydroxy, *or -OCOR30;
R2 is hydroxy, or -OCOR31;
R2a is hydrogen;
UBSTITUTE SHEET Rx is hydrogen or hydroxy;
R28 is hydrogen, acyl or hydroxy protecting group; and
R29/ R30' snd R31 are independently hydrogen, alkyl, alkenyl, alkynyl, monocyclic aryl or monocyclic heteroaryl.
4. The taxane derivative of claim 2 wherein
R14 and R14a are hydrogen;
R10 is hydrogen or together with R10a forms an oxo; R10a is hydrogen, hydroxy, -OCOR29, or together with R10 forms an oxo;
R9 is hydrogen or' together with R9a forms an oxo;
R9a is hydrogen, acyloxy or together with R9 forms an oxo;
R7 is hydrogen;
R7a is hydrogen, halogen or -OR28;
R6 and R6a are hydrogen;
R5 is hydrogen; R5a together with R4 and the carbon atoms to which they are attached form an oxetane ring;
R4a is hydroxy, or -OCOR30;
R2 is hydroxy, or -OCOR31;
R2a is hydrogen; Rj is hydrogen or hydroxy;
R28 is hydrogen, acyl or hydroxy protecting group; and
R29, R30, and R31 are independently hydrogen, alkyl, alkenyl, alkynyl, monocyclic aryl or monocyclic heteroaryl.
5. A taxane derivative having the formula
wherein
Xx is -OX6; X2 is hydrogen;
X3 is hydrogen; X4 is isobutenyl;
X5 is -COX10, -COOX10, -COSX10, -CONX8X10, or -S02Xu; X6 is hydrogen or hydroxy protecting group;
X8 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl, alkynyl, aryl or heteroaryl;
X9 is an amino protecting group; X10 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl alkynyl, aryl or heteroaryl;
Xn is alkyl, alkenyl, alkynyl, aryl, heteroaryl, -OX10, or -NX8X14; X14 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;
Rj is hydrogen, hydroxy, protected hydroxy or together with R14 forms a carbonate;
R2 is hydrogen, hydroxy, -OCOR31 together with R2a forms an oxo;
R2a is hydrogen or taken together with R2 forms an oxo or;
SUBSTITUTESHEET R4 is hydrogen, together with R4a forms an oxo, oxirane or methylene, or together with R5a and the carbon atoms to which they are attached form an oxetane ring;
R4a is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cyano, hydroxy, -OCOR30, or together with R4 forms an oxo, oxirane or methylene;
R5 is hydrogen or together with R5a forms an oxo;
R5a is hydrogen, hydroxy, protected hydroxy, acyloxy, together with R5 forms an oxo, or together with R4 and the carbon atoms to which they are attached form an oxetane ring; R6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl, hydroxy, protected hydroxy or together with R6a forms an oxo;
R6a is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl, hydroxy, protected hydroxy or together with R6 forms an oxo;
R7 is hydrogen or together with R7a forms an oxo;
R7a is hydrogen, halogen, protected hydroxy, -OR28, or together with R7 forms an oxo; R9 is hydrogen or together with R9a forms an oxo;
R9a is hydrogen, hydroxy, protected hydroxy, acyloxy, or together with R9 forms an oxo;
R10 is hydrogen or together with R10a forms an oxo;
R10a is hydrogen, -OCOR29, hydroxy, or protected hydroxy, or together with R10 forms an oxo;
R14 is hydrogen, hydroxy, protected hydroxy or together with Rx forms a carbonate; R14a is hydrogen;
R28 is hydrogen, acyl, or hydroxy protecting group; and
SUBSTITUTE SHEET R 29' R 3o and Rι are independently hydrogen, alkyl, alkenyl, alkynyl, monocyclic aryl or monocyclic heteroaryl.
6. The taxane derivative of claim 5 wherein X5 is -COX10 and X10 is furyl, thienyl, alkyl substituted furyl or thienyl, tert-, iso- or n-butoxy, ethoxy, iso- or n-propoxy, cyclohexyloxy, allyloxy, crotyloxy, 1,3- diethoxy-2-propoxy, 2-methoxyethoxy, amyloxy, neopentyloxy, PhCH20-, -NPh2, -NHnPr, -NHPh, or -NHEt.
7. A pharmaceutical composition which contains the taxane derivative of claim 1 and one or more pharmacologically acceptable, inert or physiologically active diluents or adjuvants.
8. A β-lactam of the formula
wherein
Xx is -OX6, -SX7, or -NX8X9; X2 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl;
X3 is hydrogen;
X4 is butenyl;
X5 is -COX10, -COOX10, -COSX10, -CONX8X10, or -S02Xn;
X6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, hydroxy protecting group, or a functional group which increases the water solubility of the taxane derivative;
SUBSTITUTE SHEET X7 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or sulfhydryl protecting group;
X8 is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl, alkynyl, aryl or heteroaryl; X9 is an amino protecting group;
X10 is alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterosubstituted alkyl, alkenyl alkynyl, aryl or heteroaryl;
X is alkyl, alkenyl, alkynyl, aryl, heteroaryl, -OX10, or -NX8X14;
X14 is hydrogen, alkyl, alkenyl, alkynyl, aryl, or heteroaryl.
SUBSTITUTE SHEET
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU26210/97A AU706985C (en) | 1992-11-13 | 1997-06-23 | Beta-lactams useful in the preparation of butenyl substituted taxanes |
Applications Claiming Priority (13)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/975,705 US5284864A (en) | 1991-09-23 | 1992-11-13 | Butenyl substituted taxanes and pharmaceutical compositions containing them |
US975705 | 1992-11-13 | ||
US08/005,229 US5338872A (en) | 1993-01-15 | 1993-01-15 | Process for the preparation of 10-desacetoxybaccatin III and 10-desacetoxytaxol and derivatives thereof |
US005229 | 1993-01-15 | ||
US010798 | 1993-01-29 | ||
US08/010,798 US5399726A (en) | 1993-01-29 | 1993-01-29 | Process for the preparation of baccatin III analogs bearing new C2 and C4 functional groups |
US08/026,978 US5990325A (en) | 1993-03-05 | 1993-03-05 | Process for the preparation of 9-desoxotaxol, 9-desoxobaccatin III and analogs thereof |
US026978 | 1993-03-05 | ||
US08/034,247 US5430160A (en) | 1991-09-23 | 1993-03-22 | Preparation of substituted isoserine esters using β-lactams and metal or ammonium alkoxides |
US9471993A | 1993-07-20 | 1993-07-20 | |
US094719 | 1993-07-20 | ||
PCT/US1993/010813 WO1994010996A1 (en) | 1992-11-13 | 1993-11-01 | Butenyl-substituted taxanes and composition |
US034247 | 1996-12-31 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU26210/97A Division AU706985C (en) | 1992-11-13 | 1997-06-23 | Beta-lactams useful in the preparation of butenyl substituted taxanes |
Publications (3)
Publication Number | Publication Date |
---|---|
AU5667094A AU5667094A (en) | 1994-06-08 |
AU677267B2 AU677267B2 (en) | 1997-04-17 |
AU677267C true AU677267C (en) | 1998-06-04 |
Family
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