Acid-Promoted Bicyclization of Diaryl Alkynes: Synthesis of 2<i>H</i>-Indazoles with in Situ Generated Diazonium Salt as Nitrogen Source
作者:Cheng Zhang、Sailan Chang、Shanliang Dong、Lihua Qiu、Xinfang Xu
DOI:10.1021/acs.joc.8b01199
日期:2018.8.17
excellent yields. The salient features of this reaction include readily available starting materials, good functional group compatibility, mild reaction conditions, no column chromatography, high bond-formation efficiency, and ease in further transformations. Notably, this is the first example for the synthesis of 2H-indazoles with in situ generated diazonium salt as the nitrogen source, and a mechanistic
已经公开了前所未有的二芳基炔烃的无过渡金属的串联双环化,其以高产率至优异产率提供了对一系列多环2 H-吲唑的流线型通道。该反应的显着特征包括容易获得的起始原料,良好的官能团相容性,温和的反应条件,无柱色谱法,高键形成效率以及易于进一步转化。值得注意的是,这是用原位产生的重氮盐作为氮源合成2 H-吲唑的第一个例子,并讨论了涉及酸促进的串联重氮盐形成/双环化过程的机理。