Regioselective Synthesis of Polysubstituted Carbazoles from Indoles and Simple 1,4‐Dicarbonyl Compounds
作者:Hugo Santos、Lucas A. Zeoly、Rafael Rebechi、João Arantes、Fernando Coelho、Manoel T. Rodrigues
DOI:10.1002/adsc.202301328
日期:2024.2.20
carbazoles were efficiently synthesized through direct benzannulation reaction between 1,4-dicarbonyl compounds and indoles with catalytic amount of inexpensive zirconium(IV) chloride. This transformation proved to be regioselective and furnishes 1,4-disubstituted and 1,2,4-trisubstituted carbazoles with yields ranging from 26% to 91% and broad substrate scope. Moreover, this protocol benefits from using readily
通过1,4-二羰基化合物与吲哚之间的直接苯并环化反应,在催化量的廉价氯化锆(IV)的催化下,有效地合成了多取代咔唑。该转化被证明具有区域选择性,可产生 1,4-二取代和 1,2,4-三取代咔唑,产率范围为 26% 至 91%,底物范围广泛。此外,该协议受益于使用易于获得的起始材料,而不需要对其进行预功能化。通过铃木-宫浦反应对碘咔唑进行官能化以及通过天然产物canthin-6-one的3-脱氮衍生物的合成来举例说明该产品的合成用途。