aminations of indoline with aliphatic ketones using bismuth nitrate as catalyst is described. A reaction of an equivalent amount of indoline and aliphatic cyclic and acyclic ketones provides a mixture of excessive alkylated indolederivatives over typically redox isomerization and reductive alkylation pathways while using of the five equivalent of indoline provides N‐alkylated indolines as a reductive alkylation
convenient and facile method was developed for the synthesis of 1,2,3-trisubstituted indolines. Starting from indolederivatives and ketones/aldehydes, the corresponding indoline products could be obtained with high yield by the hexamethylphosphoramide (HMPA) catalyzed indole Friedel–Crafts reaction, reduction and direct reductive amination process.
Dearomatization–Rearomatization Strategy for Reductive Cross-Coupling of Indoles with Ketones in Water
作者:Zemin Wang、Huiying Zeng、Chao-Jun Li
DOI:10.1021/acs.orglett.9b00591
日期:2019.4.5
molecules. Using ketones as N-alkylation reagent for indoles has been a great challenge not only because of the competing alkylation reaction of C-3 position but also because of the poor nucleophilicity of the nitrogen atom of indole, in addition to the steric hindrance and lower electrophilicity of the ketones. A dearomatization–rearomatization strategy has been developed for reductive cross-coupling