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■ Practical and Facile Route to a Functional Intermadiate from Stigmasterol for the Synthesis of 1α-Hydroxyvitamin D5 and Related Compounds

Michiyasu Takahashi, Seiya Hosokawa, Yuuya Ono, and Noboru Kubodera*

*International Institute of Active Vitamin D Analogs, 35-6, Sankeidai, Mishima, Shizuoka 411-0017, Japan

Abstract

As a functional and versatile intermediate for the synthesis of 1α-hydroxyvitamin D5 and related compounds, 1α,2α-epoxy-3β-hydroxystigmasta- 5,7-diene was synthesized by a practical and facile 17-step route from stigmasterol in 17% overall yield.