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A Concise Enantioselective Synthesis of a Key A-Ring Synthon for 1α-Hydroxyvitamin D3 Compounds

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journal contribution
posted on 12.01.2001, 00:00 by Hiroko Hiyamizu, Hidenori Ooi, Yoko Inomoto, Tomoyuki Esumi, Yoshiharu Iwabuchi, Susumi Hatakeyama
This report describes a concise enantioselective synthesis of the A-ring synthon for the synthesis of 1α-hydroxyvitamin D3 compounds. The synthesis involves two notable transformations:  (i) stereoselective construction of the enol triflate from the vinyl ketone by Michael addition of Ph2P(O)Li followed by in situ triflation of the resulting enolate and (ii) palladium-catalyzed Heck type cyclization of the enol triflate.

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