Procedure for the preparation of enol ethers of Δ 4-3-ketosteroids that respond to the following formula: ** (See formula) ** wherein S completes the spheroid nucleus, R 'may represent hydrogen or a methyl group, and R represents a higher aliphatic hydrocarbon radical or cycloaliphatic hydrocarbon, or still a hydrocarbon radical containing other non-alcoholic functional groups in its molecule, or an aryl radical, said process basically consisting of reacting on the ethylene-formed ether - in advance - of the Delta 4 -3-ketosteroid, the hydroxylated derivative (alcohol or phenol) of the hydrocarbon corresponding to the radical to be introduced, and subjecting , if necessary, the new enol ether thus obtained to a normal reaction of acylation, saponification or condensation, so that the desired final product is obtained. (Priority of the German application No. 16 478 of May 4, 1959). (Machine-translation by Google Translate, not legally binding)
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