Abstract

The present application relates to a process for preparation of the compound of Formula-5, a key intermediate in the production of Samidorphan. Samidorphan, also identified as 17-(cyclopropylmethyl)-4,14-dihydroxy-6-oxomorphinan-3-carboxamide or morphinan-3-carboxamide, 17-(cyclopropylmethyl)-4,14-dihydroxy-6-oxo, is represented by the structural formula-1.

Formula-1 Formula-5.

wherein n is 1, 2, 3, 4 or 5; R is hydrogen, methyl, and allyl.

The present invention also provides a process for the preparation of Samidorphan or its salts.

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