Efficient and scalable total synthesis of calcitroic acid and its 13C-labeled derivative?

RSC Advances Pub Date: 2014-07-14 DOI: 10.1039/C4RA04322G

Abstract

Calcitroic acid, the deactivated form of the physiological active vitamin D3 metabolite calcitrol, and its 13C labeled derivative has been synthesized starting from the commercially available Inhoffen-Lythgoe diol in 11 steps with an overall yield of 21%. The key steps in the synthesis were the formation of the C1-homologated nitrile with KCN and K13CN as well as the Horner–Wittig reaction with the ring A phosphine oxide reagent.

Graphical abstract: Efficient and scalable total synthesis of calcitroic acid and its 13C-labeled derivative
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