Asymmetric ring cleavage reaction with a combination of optically active cycloalkane-1,2-diol and Lewis acid: application to formal synthesis of (−)-alloyohimbane and approach to construction of adjacent chiral quaternary centers
作者:Masakazu Tanaka、Eiji Toyofuku、Yosuke Demizu、Osamu Yoshida、Koichi Nakazawa、Kiyoshi Sakai、Hiroshi Suemune
DOI:10.1016/j.tet.2004.01.015
日期:2004.3
Asymmetric ring cleavage reaction of meso-carbobicyclic ketones by a combination of benzaldehyde, chiral cycloalkane-1,2-diol, and Lewis acid gave optically active styrenyl esters of 26–69% ee in moderate yield. The ring cleavage reaction could be applied to the construction of adjacent chiral quaternary carbons, and also to the formal synthesis of natural alkaloid (−)-alloyohimbane.
苯甲醛,手性环烷-1,2-二醇和路易斯酸的组合使内消旋碳双环酮发生不对称的开环反应,得到适度收率的26-69%ee的光学活性苯乙烯基酯。环裂解反应可应用于相邻手性季碳的构建,也可应用于天然生物碱(-)-铝环戊烷的形式合成。