A new approach to a vitamin D ring C/D building block from the Hajos dione, involving epoxide opening at the more substituted carbon atom
作者:Paweł Chochrek、Alicja Kurek-Tyrlik、Karol Michalak、Jerzy Wicha
DOI:10.1016/j.tetlet.2006.06.115
日期:2006.8
1α,25-dihydroxyvitamin D3 (calcitriol) synthesis from the Hajos dione has been developed. The α,β-unsaturated carbonyl group in the Hajos dione has been protected and the carbonyl group in the five-membered ring has been used for the side chain attachment. Key steps in the six-membered ring transformation include: reduction of the carbonyl group, stereoselective epoxidation of the double bond in the
已开发出一种新的方法,用于从Hajos二酮合成1α,25-二羟基维生素D 3(骨化三醇)的反式-氢化茚构件。Hajos二酮中的α,β-不饱和羰基已得到保护,五元环中的羰基已用于侧链连接。六元环转化的关键步骤包括:羰基的还原,烯丙基醇中双键的立体选择性环氧化,在更多取代的碳原子处环氧化物的开放和区域选择性脱氧。