Preparation process for 20-keto 21(S) hydroxy steroids compounds and intermediates
AssigneeRoussel Uclaf
InventorsJean Buendia, Jean-Yves Godard, Philippe Mackiewicz, Christian Richard
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Abstract
Mixtures of compounds of ##STR1## or a mixture of the latter and a compound of the formula ##STR2## which are useful intermediates for the preparation 20-keto-21(S)-hydroxy steroids.
Claims1
A mixture consisting of compounds of ##STR7## or a mixture consisting of the compound of Formula II.sub.1 and a compound of Formula ##STR8## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is alkyl of 1 to 12 carbon atoms, R.sub.3 is alkyl of 1 to 4 carbon atoms and R is selected from the group consisting of alkyl of 1 to 6 carbon atoms, --CX.sub.3 and phenyl optionally substituted with at least one alkyl of 1 to 3 carbon atoms and X is fluorine, chlorine or bromine.
Dependencies are inferred from the claim text.