| abstract |
Procedure for the preparation of new 9beta, 10alpha-steroids, characterized in that a compound of the general formula I is prepared: ** (See formula) ** in which R1 is a 3-keto-4-dehydro, 3-keto-4,6-bisdehydro, 3-keto-1,4-bisdehydro, 3-keto-1,4,6-trisdehydro or 3-alkoxy-3 system, 5-bisdehydro, OR2 is a free hydroxy group, esterified or etherified, R3 is an alkyl or alkenyl group and Hal means a fluorine, chlorine or bromine atom, following the known methods for the elaboration of the corresponding 6-halogen-steroids of the normal series. (Machine-translation by Google Translate, not legally binding) |