Hydrochloric Acid → 16-Ethylidene-3-methoxy-1,3,5(10)-estratrien-17-one

Participants

Reaction Conditions

Reaction Steps

A solution of 5 g. of 16-dimethylaminomethylene-3-methoxy-1,3,5(10)-estratrien-17-one in 150 ml. of toluene is combined dropwise at -10° C. with 28.5 ml. of a 5% solution of methyllithium in ether. After this dropwise addition, the mixture is agitated for 15 minutes at -10° C.; then about 10 ml. of water is gently added in drops, and the reaction solution is poured into about 200 ml. of 0.5 N hydrochloric acid. The organic phase is separated, dried over sodium sulfate, and concentrated under vacuum. After crystallization of the residue from ethyl acetate/ether, 3.9 g. of 16-ethylidene-3-methoxy-1,3,5(10)-estratrien-17-one is obtained, m.p. 139°-140° C.

Provenance & Evidence