Intermediates for the sythesis of vitamin D and steroid derivatives

摘要

A compound having the structure: wherein n is an integer from 1-5; each of R1 and R2 independently is optionally substituted C1-C6 alkyl; each of W and X is independently hydrogen or C1-C6 alkyl; Y is O, S or NR3 where R3 is hydrogen, C1-C6 alkyl or a protective group; and Z is a CD ring structure of the formula a steroid ring structure of the formula or a vitamin D structure of the formula wherein each of the structures of Z optionally have one or more protected or unprotected substituents and/or one or more protective groups, and wherein any ring of the structure of Z may optionally have one or more unsaturated bonds.