Cascade Cyclization of Azadienes with Difluoroenoxysilanes: A One-Pot Formal [4 + 2] Approach to Fluorinated Polyfused Heterocycles
作者:Jinshan Li、Saimei Liu、Rong Zhong、Yaqi Yang、Jinjing Xu、Jianguo Yang、Hanfeng Ding、Zhiming Wang
DOI:10.1021/acs.orglett.1c03745
日期:2021.12.17
fluorinated polyfused heterocycles via the cascade cyclization of azadienes and difluoroenoxysilanes has been developed, leading to the facile construction of fluorinated benzofuro[3,2-b]pyridines, 5H-indeno[1,2-b]pyridines, and 5,6-dihydrobenzo[h]quinolines. This one-pot formal [4 + 2] approach involves 1,4-difluoroalkylation, desulfonylation, cyclization, and dehydrated and dehydrofluorinated aromatization
通过氮杂二烯和二氟烯氧基硅烷的级联环化,TfOH 促进了氟化多稠杂环的合成,从而轻松构建了氟化苯并呋喃[3,2- b ]吡啶、5 H-茚并[1,2- b ]吡啶, 和 5,6-二氢苯并[ h ]喹啉。这种一锅法 [4 + 2] 方法涉及 1,4-二氟烷基化、脱磺酰化、环化以及脱水和脱氟化氢芳构化,代表了二氟烯氧基硅烷在级联转化中的首次应用。此外,该方法通过合成具有强效拓扑异构酶抑制活性的生物活性分子的三种氟类似物而突出。