4-SUBSTITUTED ANDROSTENDIONE DERIVATIVES AND PROCESS FOR THEIR PREPARATION

摘要

25521-113 The invention discloses 4-substituted androstendione derivatives of the following formula (I) (I) wherein R is amino or azido, one of R1 and R2 is hydrogen and the other is hydrogen, alkyl, alkenyl or alkynyl, and (x) and (y) are each, independently, a single bond or a double bond. The compounds of formula (I) are useful aromatase inhibitors.