Preparation of 3-Diazoindolin-2-imines via Cascade Reaction between Indoles and Sulfonylazides and Their Extensions to 2,3-Diaminoindoles and Imidazo[4,5-<i>b</i>]indoles
作者:Guorong Sheng、Kai Huang、Zhihao Chi、Hualong Ding、Yanpeng Xing、Ping Lu、Yanguang Wang
DOI:10.1021/ol502423k
日期:2014.10.3
3-Diazoindolin-2-imines were constructed from indoles and sulfonylazides via an electronically matched 1,3-dipolar cycloaddition and a subsequent dehydroaromatization/ring-opening cascade. The reaction between 3-substituted indoles and sulfonyl azides provided 2-aminoindoles, while 2-substituted indoles furnished 3-aminoindoles. Moreover, 2,3-diaminoindoles could be prepared from the resulting 3-d
通过电子匹配的1,3-偶极环加成反应和随后的脱氢芳构化/开环级联反应,由吲哚和磺酰叠氮化物构建3-重氮吲哚-2-亚胺。3-取代的吲哚与磺酰叠氮化物之间的反应提供了2-氨基吲哚,而2-取代的吲哚提供了3-氨基吲哚。此外,可以由所得的3-重氮吲哚-2-亚胺和仲胺经铑催化的胺化反应制备2,3-二氨基吲哚。2,3-二氨基吲哚的进一步延伸导致咪唑并[4,5- b ]吲哚的形成。