The reaction between 3-aminocrotonates and oxindole-3-ylidene derivatives: synthesis of highly substituted pyrroles
作者:Stanley Rehn、Jan Bergman
DOI:10.1016/j.tet.2004.12.003
日期:2005.3
resulted in 2-pyrrolo-3′-yloxindoles in high yields (around 90%). At room temperature the 2-pyrrolo-3′-yloxindoles exists as keto–enol tautomers. Treatment with POCl3 yielded the 2-chloro-3-pyrrolyl indole, which gave the pyrrolo annulated indolopyran-2-one upon basic hydrolysis of 2-chloro-3-pyrrolyl indole methyl ester.
3-氨基巴豆酸酯和3-乙炔基亚吲哚在回流的甲苯中的反应以高收率(约90%)产生2-吡咯并3'-基氧吲哚。在室温下,2-pyrrolo-3'-yloxindoles以酮-烯醇互变异构体的形式存在。用POCl 3处理得到2-氯-3-吡咯基吲哚,其在2-氯-3-吡咯基吲哚甲酯的碱性水解下得到吡咯并环化的吲哚并吡喃-2-酮。