Journal of the Chemical Society. Chemical communications p. 1383 - 1385 (1987)
Update date:2022-08-16
Topics:
Barton, Derek H. R.
Wozniak, Jocelyne
Sard, Samir Z.
Reaction of the cholanic acid derivative (1) with thionyl chloride and pyridine gave, after quenching with methanol, the α-sulphine ester (3); treatment with acetic anhydride-sulphuric acid afforded the keto ester (5) which, on exposure to air in the presence of copper(II) ions and base, gave the 20-keto pregnane derivative (9) in excellent overall yield.
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