A General Synthesis of Quinoline-2,5,8(1H)-triones via Acylation of 2,5-Dimethoxyaniline with S-tert-Butyl Thioacetates by Application of the Knorr Cyclization
Silica gel-supported hetero Diels-Alder reactions of quinolinetriones
作者:JoséMaría Pérez、Pilar López-Alvarado、Miguel Ángel Alonso、Carmen Avendaño、J Carlos Menéndez
DOI:10.1016/0040-4039(96)01526-2
日期:1996.9
When 2,5,8(1H)-quinolinetriones were supported on silica gel and treated with 1-dimethylamino-1-azadienes in excess, followed by rapid chromatography, the corresponding 5,8-dihydro-1,8-diazaanthracene-2,9,10-triones or 1,8-diazaanthracene-2,9,10-triones were obtained, normally in excellent yields. This procedure minimizes or completely prevents the addition of dimethylamine to the starting quinone