AU594855B2 - Glucuronic acid derivatives of opioid antagonists - Google Patents
Glucuronic acid derivatives of opioid antagonists Download PDFInfo
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- AU594855B2 AU594855B2 AU10329/88A AU1032988A AU594855B2 AU 594855 B2 AU594855 B2 AU 594855B2 AU 10329/88 A AU10329/88 A AU 10329/88A AU 1032988 A AU1032988 A AU 1032988A AU 594855 B2 AU594855 B2 AU 594855B2
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- Prior art keywords
- glucuronide
- nalmefene
- opioid
- derivative
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- 239000003887 narcotic antagonist Substances 0.000 title description 14
- AEMOLEFTQBMNLQ-AQKNRBDQSA-N D-glucopyranuronic acid Chemical class OC1O[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@H]1O AEMOLEFTQBMNLQ-AQKNRBDQSA-N 0.000 title 1
- 229930182480 glucuronide Natural products 0.000 claims description 29
- 210000000936 intestine Anatomy 0.000 claims description 19
- 239000003401 opiate antagonist Substances 0.000 claims description 15
- 150000008134 glucuronides Chemical class 0.000 claims description 14
- 239000003814 drug Substances 0.000 claims description 13
- 239000005557 antagonist Substances 0.000 claims description 11
- 230000000968 intestinal effect Effects 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 230000009885 systemic effect Effects 0.000 claims description 7
- 125000004186 cyclopropylmethyl group Chemical group [H]C([H])(*)C1([H])C([H])([H])C1([H])[H] 0.000 claims description 6
- 230000008485 antagonism Effects 0.000 claims description 5
- TWCMVXMQHSVIOJ-UHFFFAOYSA-N Aglycone of yadanzioside D Natural products COC(=O)C12OCC34C(CC5C(=CC(O)C(O)C5(C)C3C(O)C1O)C)OC(=O)C(OC(=O)C)C24 TWCMVXMQHSVIOJ-UHFFFAOYSA-N 0.000 claims description 4
- PLMKQQMDOMTZGG-UHFFFAOYSA-N Astrantiagenin E-methylester Natural products CC12CCC(O)C(C)(CO)C1CCC1(C)C2CC=C2C3CC(C)(C)CCC3(C(=O)OC)CCC21C PLMKQQMDOMTZGG-UHFFFAOYSA-N 0.000 claims description 4
- PFOARMALXZGCHY-UHFFFAOYSA-N homoegonol Natural products C1=C(OC)C(OC)=CC=C1C1=CC2=CC(CCCO)=CC(OC)=C2O1 PFOARMALXZGCHY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims description 3
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- 229960005297 nalmefene Drugs 0.000 description 38
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- WJBLNOPPDWQMCH-MBPVOVBZSA-N Nalmefene Chemical compound N1([C@@H]2CC3=CC=C(C=4O[C@@H]5[C@](C3=4)([C@]2(CCC5=C)O)CC1)O)CC1CC1 WJBLNOPPDWQMCH-MBPVOVBZSA-N 0.000 description 24
- 230000000694 effects Effects 0.000 description 22
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- -1 Nalmefene glucuronide Chemical class 0.000 description 16
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- 229960005181 morphine Drugs 0.000 description 15
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 10
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- 208000002551 irritable bowel syndrome Diseases 0.000 description 5
- UZHSEJADLWPNLE-GRGSLBFTSA-N naloxone Chemical compound O=C([C@@H]1O2)CC[C@@]3(O)[C@H]4CC5=CC=C(O)C2=C5[C@@]13CCN4CC=C UZHSEJADLWPNLE-GRGSLBFTSA-N 0.000 description 5
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- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- 206010052105 Gastrointestinal hypomotility Diseases 0.000 description 4
- IAJILQKETJEXLJ-QTBDOELSSA-N aldehydo-D-glucuronic acid Chemical class O=C[C@H](O)[C@@H](O)[C@H](O)[C@H](O)C(O)=O IAJILQKETJEXLJ-QTBDOELSSA-N 0.000 description 4
- 230000036592 analgesia Effects 0.000 description 4
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- 125000001453 quaternary ammonium group Chemical group 0.000 description 4
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- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
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- TXAYVEITTCQVCO-OZRWLHRGSA-N [(2r,3r,4s,5r)-4,5-diacetyloxy-6-bromo-2-(hydroxymethyl)oxan-3-yl] acetate Chemical compound CC(=O)O[C@H]1C(Br)O[C@H](CO)[C@@H](OC(C)=O)[C@@H]1OC(C)=O TXAYVEITTCQVCO-OZRWLHRGSA-N 0.000 description 3
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- GYWMRGWFQPSQLK-OPHZJPRHSA-N (4r,4as,7as,12bs)-3-(cyclopropylmethyl)-7-methylidene-2,4,5,6,7a,13-hexahydro-1h-4,12-methanobenzofuro[3,2-e]isoquinoline-4a,9-diol;hydron;chloride Chemical compound Cl.N1([C@@H]2CC3=CC=C(C=4O[C@@H]5[C@](C3=4)([C@]2(CCC5=C)O)CC1)O)CC1CC1 GYWMRGWFQPSQLK-OPHZJPRHSA-N 0.000 description 2
- 206010012335 Dependence Diseases 0.000 description 2
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- 108090000137 Opioid Receptors Proteins 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 241000700159 Rattus Species 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000005904 alkaline hydrolysis reaction Methods 0.000 description 2
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- WORJEOGGNQDSOE-UHFFFAOYSA-N chloroform;methanol Chemical compound OC.ClC(Cl)Cl WORJEOGGNQDSOE-UHFFFAOYSA-N 0.000 description 2
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- 229940124636 opioid drug Drugs 0.000 description 2
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- 150000003839 salts Chemical class 0.000 description 2
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- DSRNCSJRHACUJL-JXOQMJNJSA-N (2s,3s,4s,5r,6s)-6-[[(4r,4as,7ar,12bs)-4a-hydroxy-7-oxo-3-prop-2-enyl-2,4,5,6,7a,13-hexahydro-1h-4,12-methanobenzofuro[3,2-e]isoquinoline-9-yl]oxy]-3,4,5-trihydroxyoxane-2-carboxylic acid Chemical compound O1[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1OC1=CC=C2C3=C1O[C@@H](C(=O)CC[C@@]14O)[C@]34CCN(CC=C)[C@@H]1C2 DSRNCSJRHACUJL-JXOQMJNJSA-N 0.000 description 1
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- OGLCQHRZUSEXNB-UHFFFAOYSA-N 2-Pinene-9, 10-diol Natural products OC1C(=O)OC2C(O)C(O)OC21 OGLCQHRZUSEXNB-UHFFFAOYSA-N 0.000 description 1
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- 229920000623 Cellulose acetate phthalate Polymers 0.000 description 1
- PJQUDRJHWUHSGO-UHFFFAOYSA-N D-Glucurono-6,3-lactone Natural products OC(=O)CCCCCCCC1CCC(CC(O)=O)O1 PJQUDRJHWUHSGO-UHFFFAOYSA-N 0.000 description 1
- UYUXSRADSPPKRZ-UHFFFAOYSA-N D-glucuronic acid gamma-lactone Natural products O=CC(O)C1OC(=O)C(O)C1O UYUXSRADSPPKRZ-UHFFFAOYSA-N 0.000 description 1
- UYUXSRADSPPKRZ-SKNVOMKLSA-N D-glucurono-6,3-lactone Chemical compound O=C[C@H](O)[C@H]1OC(=O)[C@@H](O)[C@H]1O UYUXSRADSPPKRZ-SKNVOMKLSA-N 0.000 description 1
- 108010049140 Endorphins Proteins 0.000 description 1
- 102000009025 Endorphins Human genes 0.000 description 1
- 108010092674 Enkephalins Proteins 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- IAJILQKETJEXLJ-UHFFFAOYSA-N Galacturonsaeure Natural products O=CC(O)C(O)C(O)C(O)C(O)=O IAJILQKETJEXLJ-UHFFFAOYSA-N 0.000 description 1
- 206010052402 Gastrointestinal hypermotility Diseases 0.000 description 1
- 102000016354 Glucuronosyltransferase Human genes 0.000 description 1
- 108010092364 Glucuronosyltransferase Proteins 0.000 description 1
- 238000006994 Koenigs-Knorr glycosidation reaction Methods 0.000 description 1
- URLZCHNOLZSCCA-VABKMULXSA-N Leu-enkephalin Chemical class C([C@@H](C(=O)N[C@@H](CC(C)C)C(O)=O)NC(=O)CNC(=O)CNC(=O)[C@@H](N)CC=1C=CC(O)=CC=1)C1=CC=CC=C1 URLZCHNOLZSCCA-VABKMULXSA-N 0.000 description 1
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- 206010028980 Neoplasm Diseases 0.000 description 1
- 229940127450 Opioid Agonists Drugs 0.000 description 1
- 241001364096 Pachycephalidae Species 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 208000007271 Substance Withdrawal Syndrome Diseases 0.000 description 1
- 241000906446 Theraps Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 229940035676 analgesics Drugs 0.000 description 1
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- GKDXQAKPHKQZSC-UHFFFAOYSA-L cadmium(2+);carbonate Chemical compound [Cd+2].[O-]C([O-])=O GKDXQAKPHKQZSC-UHFFFAOYSA-L 0.000 description 1
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- JEGUKCSWCFPDGT-UHFFFAOYSA-M hydroxide;hydrate Chemical compound O.[OH-] JEGUKCSWCFPDGT-UHFFFAOYSA-M 0.000 description 1
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- 208000018936 intestinal hypermotility Diseases 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229960003086 naltrexone Drugs 0.000 description 1
- DQCKKXVULJGBQN-XFWGSAIBSA-N naltrexone Chemical compound N1([C@@H]2CC3=CC=C(C=4O[C@@H]5[C@](C3=4)([C@]2(CCC5=O)O)CC1)O)CC1CC1 DQCKKXVULJGBQN-XFWGSAIBSA-N 0.000 description 1
- 239000004081 narcotic agent Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H17/00—Compounds containing heterocyclic radicals directly attached to hetero atoms of saccharide radicals
Description
A
59 43UP55 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 Form COMPLETE SPECIFICATION IFOR OFFICE USE Short Title: Int. Cl: Application Number: Lodged:
S
S. V
S
0@
S~
S S
S
S.
S
S. SOS 0 *5 0
S
555000
S
S 0 58* 0
S*
Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: Related Art: Whe and ga~T r r or TO BE COMPLETED BY APPLICANT Name of Applicant: Address of Applicant: Actual Inventor: Address for Service: 613 4 zc Cer,-'vc Ec- WIVA-X-ABRA-T RIE-ING- 8800 N.W. 36th Street, Miami, Florida 33166,
U.S.A.
RONALD R. TUTTLE; ROSS DIXON and MACIEJ M. SMULKOWSKI GRIFFITH HASSEL FRAZER 71 YORK STREET SYDNEY NSW 2000
AUSTRALIA
Complete Specification for the invention entitled: "1GLUCURONIC ACID DERIVATIVES OF OPIOID
ANTAGONISTS"
The following statemen~t is a full description of this invention, including the best method of performing it known to us:- 7982A/bm I 1 BACKGROUND OF THE INVENTION This invention relates to glucuronic acid derivatives of opioid antagonists, and more particularly to the therapeutic use of such compounds in the treatment of localized symptoms with a minimum of systemic effects.
Opioid antagonists are a well-known class of drugs which can be used to prevent or promptly reverse the effects of morphine-like opioid agonists. See Goodman and Gilman's The Pharmacological Basis of Therapeutics, Sixth Edition, pp. 521-525. It is known that the opioid antagonists, naloxone, is converted by the human body to the glucuronide form, although no use for this form of naloxone has been found before the present invention. Of particular interest among the known opioid antagonists is nalmefene, which was "15 first identified and claimed in U.S. Patent No. 3,814,768 as 6-methylene-6-desoxy-N-cyclopropylmethyl-14-hydroxydihydronormorphine.
The constipating effect of opioids is the oldest known 0 o effect of these drugs. Indeed constipation is the most troubling side effect when opioid drugs are employed to relieve pain. Patients who require opioid analgesics to relieve pain on a chronic basis e.g. cancer victims, suffer severe constipation. Such constipation is also common among opioid addicts, and may even be a problem for those being given opioids on a short term basis, such as patients undergoing surgery.
Sudden withdrawal of opioid drugs following prolonged exposure provokes intestinal hypermotility and diarrhea results. This withdrawal phenomenon of hypermotility and :30 diarrhea is also produced if an opioid antagonist is given after prolonged opioid administration. Thus the opioid can Scause hypomotility and constipation, and withdrawal can cause the opposite effect of hypermotility and diarrhea.
Hypomotility and hypermotility are dysmotilities at the extreme ends of the spectrum of intestinal motility. If an opioid antagonist were administered throughout the period of opioid exposure, intestinal dysmotility at both ends of the spectrum could be forestalled.
Attempts have been made to provide opioid antagonists 5945S/bm IA that would relieve the constipating effect of exogenous opioids without antagonizing the analgesic effect. This is particularly important for chronic users or addicts since systemic antagonism can cause severe withdrawal symptoms mediated by the central nervous system. One class of compounds which has been investigated for this purpose are the quaternary ammonium derivatives of known narcotic antagonists (US Patent 4,176,187). The quaternary antagonists antagonize opioid induced intestinal hypomotility at lower doses than are required to antagonize opioid induced analgesia. The selective antagonism, i.e.
more effective on intestinal hypomotility than on central nervous system analgesia, occurs because quaternary compounds are highly charged. The blood brain barrier impedes passage of highly charged drugs. Thus, the quaternary ammonium antagonists have more limited access to the opioid receptors in the central nervous system (CNS) that mediate analgesia than they do to the opioid receptors in the intestine that mediate hypomotility.
It is doubtful however that the quaternary ammonium antagonists will provide a practical solution to the clinical problem of the constipating effects of opioid analgesics. It has been known since the work of Eddy in 1933 Pharmacol. Exp. Therap., 1967, 157:185-195) that 25 "quaternarization" was a means of directing opioids away C from the CNS and toward the intestine. Yet no clinically useful quaternary opioid antagonist is available to patients. The failure of such a drug to emerge in therapeutics is likely related to the toxic effects on the :30 autonomic nervous system that are known to occur with S quaternary ammonium drugs.
In addition to relieving the constipating effects of exogenous opioids, the present invention is also directed to preventing endogenous opioids from exacerbating intestinal dysmotility of irritable bowel syndrome. In the last decade it's been discovered that the body produces its own opioids. The endogenous opioids are called endorphins and enkephalins. There is an abundance of endogenous opioids and opioids receptors in the intestinal tract. From the work of Kreek et al. (Lancet 1983 1:262) it appears that 5945S/bm 2- &L -a II ir .1 M. M .f such'endogenous opioids contribute to intestinal dysmotility. Kreek et al. have shown that the opioid antagonist naloxone relieves constipation even though the patients have not been exposed to an exogenous opioid.
Irritable bowel syndrome is a form of intestinal dysmotility well known to gastroenterologists. The syndrome is characterized by pain as well as alternating constipation and diarrhea. The endogenous opioids may exacerbate the syndrome. The hypomotility and constipation phase of the syndrome could be the result of an excessive endogenous opioid influence, while the hypermotility and diarrhea could result from an abrupt cessation of endogenous opioid activity. In irritable bowel syndrome we believe that there is an exaggerated cyclic effect of the endogenous opioids on 15 the intestines. During the upphase of the cycle the intestines can be immobilized and become physically dependent upon the endogenous opioids. During the down phase of the cycle the intestines can go into withdrawal, and thus become hypermotile and produce diarrhea. Pain can result from both constipation and diarrhea.
It appears then that a cycling auto-addiction and withdrawal is an important contributor to irritable bowel syndrome. Just as the continued presence of an opioid antagonist would prevent the addiction or physical **25 dependence of the intestines to exogenous opioids, an antagonist should similarly prevent the exacerbating influence of cycling endogenous opioids of the intestine.
It is therefore an object of the present invention to provide an opioid antagonist which has a local therapeutic 30 effect in the intestinal tract with a minimum of systemic effects, particularly central nervous system (CNS) effects.
A further object of this invention is to provide chemical analogs of known opioid antagonists which have a local intestinal effect with little or no CNS effects.
A still further object of this invention is to provide a method for treating intestinal dysmotility by administration of an opioid antagonist which has a minimum of CNS effects.
In accordance with the above objects of this invention, -3- 5945S/bm Y -L U .li. Li Y~-ili-Y -L IL.~ glucuronic acid derivatives of opioid antagonists are provided for the treatment of intestinal dysmotility with a minimum of systemic effects. Nalmefene glucuronide has been found particularly useful for achieving the objects of this invention.
DETAILED DESCRIPTION This invention uses the B-D-glucuronic acid derivatives of opioid antagonists for colon specific drug delivery.
These compounds are given by the following general formula:
COC
0 Ci o 15 2 S 0 OS*0 4r 0* 6 3 *0 wherein R 1 is either =0 or =CH 2 and R 2 is allyl or cyclopropylmethyl. Three compounds of particular interest are nalmefene -3B-D-glucuronide (R 1 is =CH 2 and R 2 is cyclopropylmethyl), naloxone -3B-D-glucuronide (R 1 is =0 and R 2 is allyl) and naltrexone -3B-D-glucuronide (R 1 is =0 and R 2 is cyclopropylmethyl).
In accordance with the present invention, it has been 25 found that these glucuronide compounds have little or no opioid antagonistic effect unless they are enzymatically cleaved to yield the free antagonist. For example: Nalmefene-3B-D-glucuronide B-glucuronidase Nalmefene glucuronic acid B-glucuronidase is a naturally occuring enzyme which is present in the bacterial flora of the lower intestinal tract, particularly in the colon. Therefore the compounds of this invention provide a means of specific delivery of an opioid antagonist to the lower intestinal tract. Opioid antagonist activity in the body outside the intestine is avoided because glucuronic acid derivatives are poorly absorbed and rapidly eliminated in the urine. Further, the glucuronides do not encounter B-glucuronidase outside the intestine.
After liberation of the aglycone antagonist in the lower intestinal tract, small amounts of this aglycone 5945S/bm -4e- L-7-.I-LC ~L :LI I_ iNi i~l- Yi-~ i~L l- I antagonist could be absorbed into the portal circulation.
However as the aglycone antagonist passes into the portal blood and through the liver it will be reconverted to its B-D-glucuronide conjugate by hepatic glucuronyl transferase. Therefore no significant amount of active antagonist will reach the systemic circulation.
An analysis of the blood and urine of rats treated with nalmefene orally showed that the concentration of nalmefene glucuronide is about 100 fold higher than is the concentration of free nalmefene. Thus nalmefene is almost totally biotransformed as a result of "first-pass" metabolism when administered orally. Such a high degree of biotransformation is common for this type of drug. However it was discovered that the relative concentrations of free 15 nalmefene and nalmefene glucuronide in the feces of these animals were in marked contrast to the blood and urine.
Whereas the ratio of nalmefene to nalmefene glucuronide in b the blood and urine was about 1:100, in the feces the ratio was about 3:1. This suggests that some of the nalmefene 20 glucuronide formed from nalmefene as a result of "first-pass" metabolism in the liver, was excreted vii the bile into the intestine and subsequently hydrolysed by intestinal micro flora to yield free nalmefene.
This observation led to developing opioid antagonist drugs with activity confined to the intestine. This 55 intestinal specificity would provide for the following three therapeutic applications: 1) Preventing the unwanted constipation (side effect) caused by opioid analgesic drugs without interfering with the wanted analgesic effect.
2) Treating idiopathic constipation.
3) Treating irritable bowel syndrome.
SYNTHESIS
The compounds according to the present invention can be prepared by the reaction of opioid antagonists salts (for example lithium salts) with the appropriate bromosugar followed by alkaline hydrolysis of the protecting groups.
These compounds can also be obtained by the Koenigs-Knorr reaction Whistler and M.L. Wolfrom, "Methods in 5945S/bm 5 I-i i- 1 Carbohydr'ate Chemistry"; R.B. Conrow and S. Bernstein, J.
Org. Chem. 1971, 863 and literature cited therein) followed by alkaline hydrolysis.
The present invention is described in more detail by way of the following non-limiting examples. Examples 1 and 2 are synthesis of precursor materials and are described in Bollenback, et al., J. Am. Chem. Soc. 1955, 3310.
Example 1.
g of D-glucurono-6,3-lactone was added to a solution of 0.11 g of sodium hydroxide in 300 ml of methanol. The mixture was stirred at room temperature for 1 hour and the methanol was then removed under vacuum. The residue was dissolved in 100 ml of pyridine and 150 ml of acetic anhydride was added at O C. After 18 hours at OC the precipitate was filtered and recrystallized from ethanol.
38 g of methyl tetra-O-acetyl-B-D-glucopyranuronate was 9 22 obtained, with M.P. 176.5-178 C; 7.668 (c 1,
D
CHC1 3 3 Example 2.
5 g of methyl tetra-O-acetyl-B-D-glucopyranuronate was dissolved in 20 ml of 30% hydrobromic acid in acetic acid and the reaction mixture was kept overnight at OC. The solvent was then removed under vacuum and the residue was dissolved in 25 ml of chloroform. This solution was *25 extracted with cold aqueous sodium bicarbonate and water, dried over sodium sulfate and the solvent was removed under vacuum. The residual syrup was crystallised from ethanol and 4.5 g of methyl(tri-O-acetyl- -D-glucopyranosyl bromide)-uronate was obtained with M.P. 105-7 C, ]D 30 196.2 (c 1, CHC1 3 Example 3.
To a solution of 2.555 g of nalmefene free base and 0.269 g of lithium, hydroxide monohydrate in 11 ml of methanol was added 2.15 g of methyl (tri-O-acetyl- -D-glucopyranosyl bromide)-uronate. After 30 min at room temperature a solution of 0.430 g of lithium hydroxide in 11 ml of water was added. After another 30 min the reaction was brought to pH 8 with acetic acid and the unreacted nalmefene was filtered off. The filtrate was evaporated and 5945S/bm 6 r r i ~i e g.
S C 0@
S.
S. S C S
OS
S
0@ SC
S
C
0 0
S
the 'residual syrup was chromatographed on a silica gel column with chloroform: methanol 3:2 as elutant. It was then further purified on an H+form ion-exchange resin with ammonium hydroxide solution as elutant and 0.78 g of nalmefene-3B-D-glucuronide was obtained.
Elemental analysis H N Calculated for C 27
H
33
NO
9 .2H 2 0 58.79 6.76 2.54 Found 58.76 '.78 2.53 Example 4.
A solution of 0.397 g of methyl(tri-O-acetyl- -Dglucopyranosyl bromide)-uronate in 10 ml of toluene was added dropwise over a period of 1 hour to a mixture of 0.17 g of nalmefene free base and 0.172 g of cadmium carbonate in ml of toluene. During the addition, 10 ml of toluene was 15 also removed from the reaction mixture by distillation.
Distillation of toluene was continued for another 0.5 hour during which time an equal volume of toluene was added dropwise to the reaction mixture. The inorganic salts were then removed by filtration and the filtrate was evaporated.
20 The residue was chromatographed on a silica gel column with chloroform methanol 9:1 as elutant. This gave 0.240 g of methyl (nalmefene-tri-O-acetyl-B-D-glucopyranosid)uronate.
Example 25 To the solution of 0.830 g of nalmefene free base and 0.087 g of lithium hydroxide monhydrate in 4 ml of methanol was added 0.7 g of methyl(tri-O-acetyl- -D-glucopyranosyl bromide)-uronate. After 30 min at room temperature the reaction mixture was brought to pH 8 with acetic acid and 30 the unreacted nalmefene was filtered off. The filtrate was evaporated and the residual syrup was chromatographed on a silica gel column with chloroform methanol 9:1 as elutant. 0.81 g of methyl(nalmefene-tri-O-acetyl-B-Dglu-opyranosid)-uronate was obtained.
Example 6.
To a solution of 0.81 g of methyl(nalmefene-tri-Oacetyl-B-D-glucopyranosid) uronate in 3.6 ml of methanol was added a solution of 0.12 g of lithium hydroxide in 3.6 ml of water. After 30 min at room temperature the reaction
*S
S
5 S C 5 5945S/bm 7 u, I 1 .li -1.1111_.-;i.i ii i i i _.i~ii i mixture was brought to pH 8 with acetic acid and the solvents were removed under vacuum. The residual syrup was purified as in example 3 and 0.41 g of nalmefene-38-Dglucuronide was obtained. This was identical to the product in example 3.
Example 7.
To a solution of 3.7 g of naloxone free base and 0.4 g of lithium hydroxide in 16 ml of water was added 3.26 g of methyl(tri-O-acetyl-B-D-glucopyranosyl bromide)-uronate.
After 30 min at room temperature a solution of 0.65 g of lithium hydroxide in 16 ml of water was added. After another 30 min the reaction was brought to pH 8 with acetic acid and the unreacted naloxone was filtered off. The filtrate was evaporated and the residual syrup was 15 crystallized from 95% ethanol and 2.27 g of naloxone-33- D-glucuronide was obtained.
Elemental analysis C H N
S.
E
S~
S
S
20
SSSS
S
S
S
S.
S
Calculated for C25H29NO102H20 Found 55.65 6.16 2.6 55.27 5.86 2.54 TEST RESULTS To determine whether nalmefene glucuronide would alleviate morphine-induced hypomotility, the charcoal meal assay method of Witkin et al. Pharmacol. Ext. Therep., 133: 400, 1961) was done on 56 mice. The results of the assay are given in Table 1 below. These results show that nalmefene-B-D-glucuronide was as effective as nalmefene in alleviating the depressant effects of morphine on intestinal transit.
*3 -8- 5945S/bm k N- J ~LI- TABLE 1 Summary of the Results of the Charcoal Meal Assay a (Gastrointestial Motility) in Mice Given Nalmefene HCl and Nalmefene-13-D-glucuronide Percent Meal Group Treatment bTraveled S.E.M.
of Mice s~e 15 990*:2 1 Saline Saline 2 Saline Morphine 3 Morphine Saline 4 Saline Nalmefene Glucuronide 5 Morphine Nalmefene Glucuronide 6 Saline Nalmefene HCl 7 Morphine Nalmefene HG 1 2 (N=1 4 c 2 c 3 c g 3 (N=8) 58 12 dlelhli 63 2 66 14 dlelf 0..525 *00 6 0 594 5S/bin-9 9 h" a- j I -1-1 4i- 4-t aWitkin et al., JPET 133: 400, 1961.
bThe first vehicle or drug listed under Treatment was given 30minuts before the second vehicle or drug listed.
The results were determined 30 min later. All treatments are p.o. and given in a volume of 0.3 ml.
Doses were 10 mg/kg for morphine, 15 mg/kg or 2.9 x 106 M/kg for nalmefene glucuronide and 2.9 x 10 6 M/kg for nalmefene HC1.
cSignificantly different (p<0.05) from Saline Saline controls.
No significant difference compared with Saline Saline group.
Significantly different (p<0.05) from Morphine Saline group.
f g 0 :15 No significant difference compared with Saline Nalmefene group.
No significant difference compared with Saline Morphine Sgroup.
No significant difference compared with Saline Nalmefene Glucuronide.
No significant difference compared with Morphine nalmefene group.
Group 1 shows that the percentage of the intestinal tract travelled by the charcoal meal when no drug is given '*25 (just vehicle control) is 69 Morphine (groups 2 and 3) reduced the percentage of the intestine travelled by more than half.
In the absence of morphine neither nalmefene (group 6) nor nalmefene glucuronide (group 4) had any significant 30 effect. However both nalmefene (group 7) and nalmefene glucuronide (group 5) protected the intestine against the depressant effect of morphine. In these latter two groups the percentage of intestine travelled was not significantly less than in the grou (group 1) where no morphine was present.
Having found that nalmefene-38-D-glucuronide was as effective as nalmefene in preventing morphine-induced intestinal hypomotility, experiments were done to determine whether nalmefene-glucuronide lacked opioid antagonist effect in the central nervous system.
5945S/bm 9A The Rapid Quantitative In Vivo Assay for Narcotic Antagonist of Katovich et al. (Substance and Alcohol Actions/Misuse, vol 5: 87095, 1984) was used. This assay is based on the extreme sensitivity of opioid-dependant animals to narcotic antagonists. Injection of these animals with a narcotic antagonist produces severe central nervous system withdrawal signs. One of these signs is an abrupt rise in the skin temperature of the tail.
Figure 1 shows the marked rise in skin tail temperature in response to nalmefene in doses as low as 10g/kg. Yet, as Figure 2 shows, an /o injection of 1000 g/kg of nalmefene glucuronide had no effect.
Additional studies in rats using 14C labelled nalmefene glucuronide demonstrated that nalmefene glucuronide is not absorbed to any measurable extent following oral administration of doses as high as 40 mg/kg. No radioactivity could be detected in plasma 2 hours after dosing while about of the dose was present in the small intestine still as nalmefene glucuronide. However the 2-3% of the dose which had reached the cecum by Sthis time was almost exclusively free nalmefene. Therefore the glucuronide of an opioid antagonist provides a means of preventing narcotic-induced intestinal hypomotility without interfering with central nervous system ,o aeffects of narcotics, such as analgesia.
The glucuronide derivatives should be administered orally, preferably in the form of capsules or tablets. Known coating and tabletting agents S can be used. As examples, known enteric coatings like polyacrylates and cellulose acetate phthalates may be used as coatings for the active S 2• ingredient. The amount of glucuronide derivative administered at one time Sis from about 0.1 to 50 mg, preferably 0.5 20 mg.
The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features O3 shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.
1 nf U= I*
Claims (9)
1. A composition for site-specific delivery of an opioid antagonist to the intestine of a subject without substantial systemic effects, comprising nalmefene-3$-D glucuronide or naltrexone-3/-D-glucuronide in an amount sufficient to provide opioid antagonism to the intestine of the subject and a pharmaceutically acceptable carrier for oral administration.
2. A method for providing site specific opioid antagonism in the intestine of a subject without substan- tial systemic effects, comprising orally administering to said patient an amount of an opioid antagonist in the form of a glucuronide derivative having the formula: OH cOoH oo *oH o
3. The method of claim 2, wherein the glucur- onide derivative is selected from naloxone-3 -D-glucuronide and naltrexone-3(,-D-glucuronide. s -11-
4. The method of Claim 3, wherein the glucur- onide derivative is nalmefene-3-D-glucuronide.
A compound of formula: Coo H O o ooM wherein R 1 is =CH 2 and R2 is cyclopropylmethyl.
6. A compound according to Claim 5, wherein R 1 is =0 and R 2 is cyclopropylmethyl.
7. A method of treating intestinal dysmotility in a subject suffering from an intestinal dysmotility, without substantial systemic effects, comprising orally administering to the subject an opioid antagonist in the form of a glucuronide derivative, having the formula: 0 0 0@ *e 00 00 0 0e -12- 5945S/bm 1A I S 4e -9 0~ #5 S 0 *049 S S. 0 9 5** a.
S. *0 S S S. 0 S *5 S 0*~p 4 5* 0 6~ 0
9. wherein R 1is =0 or=CH 2and RP2 is allyl or cyclopropylmethyl, the amount of said glucuronide derivative being sufficient to provide opioid antagonism in the intestine of the subject, the glucuronide derivative undergoing, enzymatic cleavage in the intestine of the subject to assume the aglycone form of the antagonist. 8. The method of Claim 7, wherein the glucur- onide derivative is selected from nalmefene-33- D-glucuronide, naloxone-3g0-D-glucuronide and naltrexone-309-D-glucuronide. 9. The method of Claim 8, wherein the glucur- onide derivative is nalmefene-34'-D-glucuronide. DATED TH'IS 19th DAY OF DECEMBER 1989 Baker Cummins Pharmaceuticals, Inc. By Their Patent Attorney GRIFFITH HACK &,CO. 13
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AU5112079A (en) * | 1978-10-13 | 1981-04-16 | Century Science Corporation | Treatment and detection of beta-glucuronidase activity conditions with glucuronides |
AU1601483A (en) * | 1982-05-24 | 1983-12-16 | Repligen Corp. | Glucuronides and methods for their preparation |
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AU5112079A (en) * | 1978-10-13 | 1981-04-16 | Century Science Corporation | Treatment and detection of beta-glucuronidase activity conditions with glucuronides |
AU1601483A (en) * | 1982-05-24 | 1983-12-16 | Repligen Corp. | Glucuronides and methods for their preparation |
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