Zn(ClO 4 ) 2 .6H 2 O proved to be a very powerfulcatalyst for the condensation of primary and secondary amines with β-ketoesters to give N-substituted β-enaminoesters.
The reaction between ethyl 2-chloro-3-(phenylamino)but-2-enoate (5) and aniline gave 4-methyl-3(phenylamino)quinolin-2(1H)-one (6) and not, as reported earlier in the literature, the isomeric 2-methyl-3( phenylemino)quinolin-4(1H)-one (1). The latter could be prepared by an alternative procedure. The structures of both isomers were established by extensive NMR spectroscopy including 1D-NOE, 2D-HSQC, and HMBC experiments. Consequently, the reinvestigation of the title reaction revealed an unexpected simple access to never 4-alkyl-substituted 3-(arylamino)quinolin-2(1H)-ones.
Redox Property of Enamines
作者:Yao Li、Dehong Wang、Long Zhang、Sanzhong Luo
DOI:10.1021/acs.joc.9b02003
日期:2019.9.20
among a range of catalytically relevant enamines. Spin population analysis disclosed that enamine radical cations mainly exhibit the carbon-center free radical feature. Taking experimental and computation data together, a comprehensive picture about the redox property of enamines is presented, which would provide guidance in the development of oxidative enamine catalysis and transformations.