25-Carboxylic acid derivatives in the vitamin D series, process for their production, intermediate products for these processes, pharmaceutical preparations containing these derivatives as well as their use for the production of pharmaceutical agents

摘要

New 25-carboxylic acid derivatives of general formula I, <IMAGE> (I) R19 and R19a each mean a hydrogen atom or together form an exocyclic methylene group, R21 and R21a independently of one another mean a hydrogen atom, a chlorine or fluorine atom, an alkyl group with 1 to 4 carbon atoms, together a methylene group, together with quaternary carbon atom 20 mean a 3-7 membered, saturated or unsaturated carboxylic ring, Y preferably means a derivatized carboxyl radical, and the other substituents have the meanings indicated in the description as well as process for their production, are described. The new compounds have vitamin D activity as well as proliferation-inhibiting and cell-differentiating effects and are suitable for the production of pharmaceutical agents.