Preparation and analgesic activity of 3,6-diacetylnormorphine and 6-acetylnormorphine

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Abstract
3,6-Diacetylnormorphine (norheroin) and 6-acetylnormorphine have been prepared in excellent yield through the 3,N-bis(tert-butoxycarbonyl) derivative of normorphine via acetylation and selective removal of protecting groups. This general procedure would be applicable to the preparation of various 3,6-diesters or 6-monoesters of normorphine. The analgesic potency of norheroin was found to be the same as that of 6-acetylnormorphine, about 0.05 that of heroin. The onset, peak, and duration of action of these compounds were nearly identical and comparable with morphine.

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