Add time:07/31/2019         Source:sciencedirect.com

A new, highly stereoselective synthesis of (E)-droloxifene is reported. Deprotection of 3,4′-dimethoxybenzophenone and selective pivaloylation of the 3′-phenolic position gave 4-hydroxy-3′-(trimethylacetoxy)benzophenone. A McMurry reaction between the preceding benzophenone and propiophenone gave the (E)-olefin as a major product (14:1 E/Z ratio in crude reaction), which was then alkylated with 2-dimethylaminoethyl chloride and deprotected to yield (E)-droloxifene with a >100:1 E/Z ratio (5 steps, 13%). Attempts to use this strategy as a suitable stereoselective method to obtain (Z)-droloxifene were not successful.

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