3-Oxo or 3-hydroxy derivatives of 17-alpha, 20-epoxy pregnan-20-carboxylic acids, preferably isocyanate derivatives, their use and process for preparing 3-oxo or 3-hydroxy, 17-alpha hydroxy-20-oxo pregnanes and their esters

摘要

the subject of the invention are intermediates available 3 - (oxo) - 3 - (hydroxy) - substituted 17a, 20 (epoxy) - pregnan - 20 - carboxylic acid and isocyanate derivatives of the general formula