Products with a new steroid dihydropyridines oxazolyl radical in 23 - position, method for their production, their use in the production of products of the row of 20 - ketopregnane and intermediates in the use of

摘要

The invention relates to the products of formula: & br / (see appended drawing in bopi) & br / in which r is h or ch, r is ch or ch, r and r is h or alk c. / p & & p & a, b, c, d are optionally one or more double bonds and one or more functional groups oh, c o optionally protected, one or several halogen, one or several alk radicals, alkoxy, c, alkenyl or alknynyle c. the line dotted any represents a double bond, their process of preparation, their application for the preparation of 20 # cetopregnanes and