[EN] BENZYL-SUBSTITUTED TETRACYCLIC HETEROCYCLIC COMPOUNDS AS PDE5 INHIBITORS [FR] COMPOSÉS HÉTÉROCYCLIQUES TÉTRACYCLIQUES À SUBSTITUTION BENZYLE COMME INHIBITEURS DE PDE5
Metal‐ and Solvent‐Free Synthesis of Maleimide Fused Carbazoles from (Indol‐3‐Yl)cyclohexanones and Maleimides
作者:Fang Fang、Haolin Zheng、Weipeng Li、Guojiang Mao、Shanping Chen、Guo‐Jun Deng
DOI:10.1002/adsc.202200241
日期:2022.7.5
A metal- and solvent-free strategy for the preparation of maleimide-fused carbazoles has been developed. This protocol started from 2-(indol-3-yl)cyclohexanones and maleimides, providing various maleimide-fused carbazoles in 45–90% yields. The present approach was catalyzed by trimethylsulfoxonium iodide and involved a cascade of oxidation, [4+2] annulation, and dehydrogenative aromatization. Moreover