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Catalytic asymmetric synthesis of trans-configured β-lactones: Cooperation of Lewis acid and ion pair catalysis

机译:反式构型β-内酯的催化不对称合成:路易斯酸和离子对催化的协同作用

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摘要

The 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 also be applied to aromatic aldehydes and offers broad applicability (29 examples). The utility was further demonstrated by nucleophilic ringopening reactions that provide highly enantiomerically enriched anti-aldol products.
机译:描述了酰基卤与具有3,4-二取代的β-内酯的脂族醛的第一反式选择性催化不对称[2 + 2]环缩合的发展。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非质子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)。通过亲核性开环反应进一步证明了该实用性,所述亲核性开环反应提供了高度对映体富集的抗醛醇缩合产物。

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