Synthesis of Spirooxindole‐Benzo[d]oxazoles and Dihydrobenzofurans through Cycloaddition and Rearrangement of
<i>N</i>
‐Vinyl Nitrones and Arynes
作者:Hao Yuan、Dong‐Liu Lu、Cui Liang、Dong‐Liang Mo
DOI:10.1002/adsc.202101372
日期:2022.4.12
[3+2] cycloaddition and selective rearrangement of N-vinyl oxindole nitrones and arynes under transition metal-free conditions. Experimental results showed that the substituent on the nitrone N-vinyl group controlled the [1,3]- or [3,3]-rearrangement of their cycloadduct owing to its steric effect. The present method features broad substrate scope, good functional group tolerance, controllable [1,3]-
在无过渡金属条件下,通过 [3+2] 环加成和N-乙烯基羟吲哚硝酮和芳烃的选择性重排,以良好至优异的产率制备了各种螺氧吲哚-苯并 [d] 恶唑和二氢苯并呋喃。实验结果表明,硝酮N-乙烯基上的取代基由于其位阻效应控制了它们的环加合物的[1,3]-或[3,3]-重排。本方法具有广泛的底物范围、良好的官能团耐受性、可控的[1,3]-或[3,3]-重排以及多种羟吲哚支架。