1997 vitamins

vitaminsU 0900

10 - 178Oxidation of Natural Targets by Dioxiranes. Part 4. High Stereo- andRegioselective Conversion of Vitamin D2 to Its (all-R) Tetraepoxideand C-25 Hydroxy Derivative. — The tetraepoxides (II) and eventhe C-25 functionalized product (III) can be obtained upon reaction withmethyl(trifluoromethyl)dioxirane. The less powerful dimethyldioxirane leads tothe triepoxide (IV) as the main product. — (CURCI, R.; DETOMASO, A.;LATTANZIO, M. E.; CARPENTER, G. B.; J. Am. Chem. Soc. 118 (1996) 45,11089-11092; Dip. Chim., Univ. Bari, I-70126 Bari, Italy; EN)

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