A gallium-catalysed, direct cyanation reaction of aromatic and heteroaromatic C-H bonds with cyanogen bromide was developed as a practical synthetic method for the preparation of aromatic nitriles.
开发了一种镓催化的芳香族和杂芳香族CH键与溴化氰的直接氰化反应,作为制备芳香腈的一种实用合成方法。
A novel base-promoted intramolecular cyclization approach for the synthesis of benzofurans, benzothiophenes and indoles
作者:Qianqian Zhang、Hanyu Nie、Kun Zhang、He Huang、Chuanjun Song
DOI:10.1016/j.tet.2022.132815
日期:2022.6
A facile transition-metal-free method for the synthesis of benzofuran was developed via potassium t-butoxide promoted intramolecular cyclization of o-bromobenzylketones. This method showed a wide range of substrate tolerability affording substituted benzofurans in moderate to good isolated yields. In addition, thio-ketones and imines could also be converted to corresponding benzothiophenes and indoles