Synthesis of Benzofurans and Benzoxazoles through a [3,3]-Sigmatropic Rearrangement: O–NHAc as a Multitasking Functional Group
作者:Dingyuan Yan、Heming Jiang、Wenxue Sun、Wei Wei、Jing Zhao、Xinhao Zhang、Yun-Dong Wu
DOI:10.1021/acs.oprd.9b00002
日期:2019.8.16
The synthesis of heterocycles relies heavily on diverse sigmatropic rearrangements triggered by the cleavage of X–Y (X, Y = C, O, N, S, I) bonds. However, a unified rearrangement approach for constructing heterocyclic libraries is highly desirable. Encouraged by computational analysis of [3,3]-sigmatropic rearrangements, we can now rapidly synthesize oxa-heterocycles by treating N-phenoxyacetamides
杂环的合成在很大程度上取决于由X–Y(X,Y = C,O,N,S,I)键断裂引发的各种σ重排。然而,非常需要用于构建杂环文库的统一重排方法。通过对[3,3]-σ重排的计算分析的鼓励,我们现在可以通过使用包含sp杂化碳的化合物处理N-苯氧基乙酰胺(Ph-ONHAc)来快速合成氧杂杂环。该过程的普遍性可以通过天然产物(包括雌酮和批准的药物)的后期多元化来说明。实验和计算研究的组合表明,反应是通过类似Claisen的[3,3] -sigmatropic重排/环化过程进行的。