PRODUCTS USEFUL FOR THE PREPARATION OF SERIES 20-KETO P REGNANE PRODUCTS

摘要

The invention relates to compounds of formula (V): IMG (V) wherein Hal is a halogen atom, R1 represents a hydrogen atom or a methyl radical, R2 represents a methyl or ethyl radical, the rings a, B, C, D or may not bear one or more double bonds and are unsubstituted or substituted by one or more hydroxyl or ketone functions unprotected or protected by one or more halogen atoms, by one or more alkyl or alkoxy radicals containing 1 to 4 carbon atoms or by one or more alkenyl or alkynyl radicals containing 2 to 4 carbon atoms, R represents a halogen atom, a hydroxyl radical, an alkoxy radical having from 1 to 6 carbon atoms, an aralkoxy radical having 7 to 15 carbon atoms, a radical: IMG wherein R3 and R4, identical or different, represent a hydrogen atom, an alkyl radical having 1 to 6 carbon atoms, an aralkyl radical having 7 to 15 carbon atoms or R3 and R4 form together with the nitrogen atom to which they are linked a heterocycle with or without a further heteroatom selected from nitrogen and oxygen atoms, or R represents an alkylthio radical having from 1 to 6 carbon atoms, an alkylthio or aralkylthio group having at most 15 carbon atoms, with the exception of the product in which R represents a methoxy radical, R1 and R2 each represent a methyl radical the ring a bears one-3-beta-acetoxy function and ring B carries a double bond 5 (6). These products of formula (V) are useful for the preparation of products of the series of progesterone.