作者:Viju Balachandran Kammath、Peter Šebej、Tomáš Slanina、Zdeněk Kříž、Petr Klán
DOI:10.1039/c1pp05096f
日期:2012.3
A new concept of a photoremovable chiral auxiliary (PCA), based on the chiral benzoin chromophore, is introduced. This moiety can control the asymmetric formation of a Diels–Alder adduct, and then be removed in a subsequent photochemical step in high chemical and quantum yields. Selective formation of the products at up to 96% ee was observed in the presence of a Lewis acid catalyst in the case of a 2-methoxybenzoinyl chiral auxiliary.
介绍了一种基于手性苯偶姻发色团的全新光可逆手性助剂(PCA)概念。该基团能够控制不对称Diels-Alder加合物的形成,然后在随后的光化学步骤中以高化学和量子产率被移除。在使用2-甲氧基苯偶姻基手性助剂的情况下,有Lewis酸催化剂存在时,产物的不对称选择性达到高达96% ee(对映体过量百分比)。