Infoscience

Journal article

Facile and selective metalation of 7-dehydrocholesterol (pro-vitamin D3)

Successive treatment of 7-dehydrocholesterol (I) with Me3SiCH2K in THF, dry ice, mineral acid, and diazomethane gives a regioisomerically pure, homoconjugated ester II as a diastereomeric mixt., the minor component of which is thermodynamically more stable than the conjugated isomer III. [on SciFinder (R)]

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