Copper(I)-Catalyzed Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides with Vinyl Sulfones
作者:Juan Carretero、Tomás Llamas、Ramón Gómez Arrayás
DOI:10.1055/s-2007-965926
日期:2007.3
The combination of copper(I)-Taniaphos (5 mol%) is an efficient Lewis acid catalyst for the promotion of the asymmetric 1,3-dipolar cycloaddition of azomethine ylides to aryl vinyl sulfones, providing 3-sulfonylpyrrolidines in good yields and with nearly complete exo-selectivity and good enantiocontrol (typically 65-85% ee). The transformation of the cycloadducts into cis-2,5-disubstituted pyrrolidines
铜 (I)-Taniaphos (5 mol%) 的组合是一种有效的路易斯酸催化剂,可促进偶氮甲碱叶立德与芳基乙烯基砜的不对称 1,3-偶极环加成,以良好的收率和几乎完全的外选择性和良好的对映控制(通常为 65-85% ee)。在简单的重结晶、N-甲基化和随后的还原脱磺酰化之后,环加合物转化为高对映纯度(>99% ee)的顺式-2,5-二取代吡咯烷已完成。