Novel ester derivatives of buprenorphine and their preparation processes, and long acting analgestic pharmaceutical compositions
First Claim
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1. A dibuprenorphine dicarboxylic ester derivative of formula (II):
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Abstract
Disclosed herein are novel buprenorphine monocarboxylic ester derivatives and dibuprenorphine dicarboxylic ester derivatives which exert a longer analgesic effect as compared to buprenorphine hydrochloride. Also disclosed are the processes for synthesizing the novel ester derivatives of buprenorphine, and long-acting analgesic pharmaceutical compositions containing a compound selected from buprenorphine base and the novel ester derivatives of buprenorphine.
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14 Claims
- 1. A dibuprenorphine dicarboxylic ester derivative of formula (II):
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5. An analgesic pharmaceutical composition for intramuscular or subcutaneous administration, comprising
a therapeutically effective amount of a compound selected from the group consisting of buprenorphine base of formula (A) a buprenorphine monocarboxylic ester derivative of formula (I) wherein R is selected from the group consisting of a straight-chain or branched saturated or unsaturated aliphatic group optionally substituted with an aryl group, and an aryl group optionally substituted with a straight-chain or branched saturated or unsaturated aliphatic group, with the proviso that R is not selected from methyl, ethyl, propyl, n-butyl, n-pentyl, n-hexyl and isopropyl; - and
a buprenorphine dicarboxylic ester derivative of formula (II) wherein R1 is a divalent moiety of a saturated or unsaturated aliphatic group optionally substituted with a phenyl group; and
a pharmaceutically acceptable oil carrier. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification