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Transformation of D : A-Friedo-18β-lup-19-en-3-one into D : B-Friedo-18β,19αH-lup-5-en-3β-ol and a Comment on the Structure of Guimarenol
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Abstract
D:A-friedo-18β-lup-19-en-3-one was transformed into D:B-Friedo-18β,19αH-lup-5-en-3β-ol by two routes, 1) bromination-dehydrobromination of an enol benzoate of D:A-friedo-18β,19αH-lupan-3-one and 2) BF3·Et2O-catalyzed backbone rearrangement of 3β,4β-epoxy-D:A-friedo-18β, 19αH-lupane. The 18βH,19αH-configuration in these D:A- and D:B-friedo-type lupane derivatives was determined by means of X-ray diffraction for a 3α,4α-epoxide derived from D:A-friedo-18β,19αH-lupan-3β-ol. The synthetic D:B-friedo-18β,19βH-lup-5-en-3β-ol was found to be not identical with guimarenol isolated from Ceropegia dichotoma.
Oxford University Press (OUP)
Title: Transformation of D : A-Friedo-18β-lup-19-en-3-one into D : B-Friedo-18β,19αH-lup-5-en-3β-ol and a Comment on the Structure of Guimarenol
Description:
Abstract
D:A-friedo-18β-lup-19-en-3-one was transformed into D:B-Friedo-18β,19αH-lup-5-en-3β-ol by two routes, 1) bromination-dehydrobromination of an enol benzoate of D:A-friedo-18β,19αH-lupan-3-one and 2) BF3·Et2O-catalyzed backbone rearrangement of 3β,4β-epoxy-D:A-friedo-18β, 19αH-lupane.
The 18βH,19αH-configuration in these D:A- and D:B-friedo-type lupane derivatives was determined by means of X-ray diffraction for a 3α,4α-epoxide derived from D:A-friedo-18β,19αH-lupan-3β-ol.
The synthetic D:B-friedo-18β,19βH-lup-5-en-3β-ol was found to be not identical with guimarenol isolated from Ceropegia dichotoma.
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