Control of stereoselectivity in samarium metal induced cyclopropanations. Synthesis of 1,25-Dihydroxycholecalciferol

DOI: 10.1016/S0040-4039(00)79919-9

Source and publish data:

Tetrahedron Letters p. 2343 - 2346 (1991)

Update date:2022-08-03

Topics:

Authors:

Kabat Kabat

Kiegiel Kiegiel

Cohen Cohen

Toth Toth

Wovkulich

Uskokovic

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Article abstract of DOI:10.1016/S0040-4039(00)79919-9

1,25-Dihydroxycholecalciferol (23) was synthesized from A-ring precursor 18 and Windaus-Grundmann ketone 19 via cyclovitamin D 21. Key reactions include highly stereoselective (5 to 6) and stereospecific (13 to 14) cyclopropanations.

Full text of DOI:10.1016/S0040-4039(00)79919-9

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Product name:-(1,1-dimethylethyl)<(1-ethynyl-2-methylenebicyclo<3.1.0>hexan-3-yl)oxy>diphenylsilane

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