Preparation of .DELTA..sup.9(11) steroid
AssigneeRoussel Uclaf
InventorsJean Buendia, Patrick Roussel, Michel Vivat
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Abstract
A process for the preparation of a compound of the formula ##STR1## comprising reacting a compound of the formula ##STR2## with chlorosulfonic in an organic solvent wherein the reaction is effected at -20.degree. C. to -10.degree. C. and the temperature is then allowed to rise to 0.degree. C. to 5.degree. C.
Claims5
A process for the selective preparation of a compound of the formula ##STR5## comprising reacting a compound of the formula ##STR6## with chlorosulfonic acid in polar, aprotic solvent wherein the reaction is effect at -20.degree. C. to -10.degree. C. and the temperature is then allowed to rise to 0.degree. C. to 5.degree. C.
Dependencies are inferred from the claim text.