Cenes Limited

Genadi Nisnevitch

Arie L Gutman

Lev Yudovitch

Igor Rochman

Igor Rokhman

Conjugation of 4,5-Epoxymorphinan-6-ols with Bromoglucuronides in the presence of Zinc containing compounds as activator under conditions capable of forming 4,5-Epoxymorphinan-6-oxyglucuronides is disclosed. This novel approach provides an efficient method for preparation of both anomers of 4,5-Epoxymorphinan-6-oxyglucuronides. The deprotected end products are useful as analgesic agents.

Process for preparation of 4,5-epoxymorphinan-6-oxyglucuronides

Glycosidation of 4,5-Epoxymorphinan-6-ols with a Thioglycoside as a glycoside donor is disclosed. The process comprises reacting a 4,5-Epoxymorphinan-6-ol and a Thioglycoside in the presence of a thiophilic promoter under conditions capable of forming 4,5-Epoxymorphinan-6-glycosides. This novel approach was used for preparation of pharmaceutically important 4,5-Epoxymorphinan-6-&bgr;-D-glucuronides. The process provides both high stereo-selectivity and high yields.

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Nesher, Israel

Genadi Nisnevitch