Catalytic Asymmetric Synthesis of trans-Configured β-Lactones: Cooperation of Lewis Acid and Ion Pair Catalysis
作者:Thomas Kull、José Cabrera、René Peters
DOI:10.1002/chem.201000840
日期:——
development of the first trans‐selective catalytic asymmetric [2+2] cyclocondensation of acyl halides with aliphatic aldehydes furnishing 3,4‐disubstituted β‐lactones is described. This work made use of a new strategy within the context of asymmetric dual activation catalysis: it combines the concepts of Lewis acid and organic aprotic ion pair catalysis in a single catalyst system. The methodology could
描述了酰基卤与脂肪族醛(提供3,4-二取代的β-内酯)的首次反式选择性催化不对称[2 + 2]环缩合反应的发展。这项工作在不对称双活化催化的背景下利用了一种新的策略:它将路易斯酸和有机质子惰性离子对催化的概念结合在一个单一的催化剂体系中。该方法还可以应用于芳族醛,并具有广泛的适用性(29个示例)。亲核开环反应进一步证明了其实用性,该反应提供了高度对映体富集的抗醛醇缩合产物。