Roussel Uclaf

Centre National De La Recherche Scientifique

Université De Perpignan Via Domitia

Remi Chauvin

Jean Buendia

Michel Vivat

Stéphane Thil

Julien Nou

Stéphane Grieu

A compound of the formula ##STR1## wherein R is .dbd.O or ##STR2## and the rings A and B are selected from the group consisting of ##STR3## K is oxo or a protector group of oxo of the formula ##STR4## n is 2 or 3 and R.sub.1 is an ether or ester remainder, K' is oxo or a protector oxime, hydrazone or semicarbazone group and the wavy lines symbolize an isomer mixture, a process for their preparation and their use as intermediates.

17, 20-epoxy steroids

A compound of the formula ##STR1## wherein R is=0 or ##STR2## and the rings A and B are selected from the group consisting of ##STR3## K is oxo or a protector group of oxo of the formula ##STR4## n is 2 or 3 and R.sub.1 is an ether or ester remainder, K' is oxo or a protector oxime, hydrazone or semicarbazone group and the wavy lines symbolize an isomer mixture, a process for their preparation and their use as intermediates.

Process for preparing 17,20-epoxy steroids

Growing community of inventors

Le Pecq, France

Remi Chauvin