STEROID INTERMEDIATE, METHOD FOR PRODUCTION THEREOF, AND METHOD FOR PRODUCING ANOTHER STEROID INTERMEDIATE THEREFROM

摘要

A compound having the general formula wherein R1 is a lower alkyl group, R2 is hydrogen or a lower alkyl group and Y is a protected hydroxyl group, for example, (+/-)-3 beta -tert.butoxy-2,3,3a,4,5,7,8,9,9a beta ,9b alpha -decahydro-3a beta -methyl-6-(3-butenyl)-1H-benz(e)inden-7-one, which is an intermediate for steroids, is prepared by dehydrative cyclization of a compound of the general formula wherein the symbols of R1, Y and R2 are same as defined above.