Novel derivatives of 6-methyl 19-NOR progesterone¹substituted in postion 3 and a process for their production

摘要

The invention relates to the field of organic chemistry and more particularly to therapeutical chemistry. It relates in particular to 6-methyl 19-nor pregna 4,6-diene 20-one having general formula (I) wherein R1? is hydrogen and R2? is a radical OR3? wherein R3? is hydrogen or an acyl residue or R1? and R2? form together a group oximino =N-OR4?, or alkylene dioxy optionally substituted, or R1? and R2? are each a lower alkoxy radical or alkylene dioxy optionally substituted and Ac is the acyl residue of an organic carboxylic acid. The compounds of formula (I) are active principles of progesteronic medicaments.