PROCESS FOR PRODUCING VITAMIN D DERIVATIVES MODIFIED AT THE 20 POSITION, PHARMACEUTICAL COMPOSITIONS CONTAINING THE SAME AND INTERMEDIATES

摘要

The invention relates to vitamin D derivatives, modified in 20-position, of general formula I IMAGE I in which X, Y, Z, R1, R2 as well as R3 have the meaning indicated in the description, process for their production and their use as agents for treatment of hyperproliferative diseases of the skin.