By developing a diastereoselective reaction of cyclopropene carboxylic acids with α,β‐unsaturated 2‐acyl imidazoles, we reported here a Michael‐type trapping of transient carboxylic oxonium ylides. This transformation provides a direct approach for the construction of valuable γ‐butenolide derivatives in good yields (60–99%) with high diastereoselectivities (up to >95:5 dr) under mild reaction conditions.

中文翻译：

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α，β-不饱和2-酰基咪唑类对瞬态羧酸氧鎓盐的非对映选择性捕获

通过开发环丙烯羧酸与α，β-不饱和2-酰基咪唑的非对映选择性反应，我们在此报道了瞬态羧酸氧鎓叶立德的Michael型捕集。这种转化为在温和的反应条件下以高非对映选择性（高达> 95：5 dr）以高收率（60–99％）构建有价值的γ-丁烯内酯衍生物提供了一种直接方法。