Electrosynthesis of 3-Chloro-1,4-disubstituted-2(1<i>H</i>)- quinolinones and 3,3-Dichloro-4-hydroxy-1,4-disubstituted- 3,4-dihydro-2(1<i>H</i>)-quinolinones, as Well as a New Convenient Process to Dioxindoles
作者:Belén Batanero、Fructuoso Barba
DOI:10.1021/jo0267403
日期:2003.5.1
reduction of N-(2-acyl(or aroyl)phenyl)-2,2,2,-trichloro-N-alkylacetamide at -1.2 V (vs SCE) under aprotic conditions yields 3-chloro-1,4-disubstituted-2(1H)-quinolinones (1) as the major product. When the reaction is carried out at -0.8 V (vs SCE), 3,3-dichloro-4-hydroxy-1,4-disubstituted-3,4-dihydro-2(1H)-quinolinones (2) and 1,4-disubstituted-1,4-dihydro-quinoline-2,3-dione (3) are formed. Ring contraction
N-(2-酰基(或芳酰基)苯基)-2,2,2,-三氯-N-烷基乙酰胺在非质子条件下在-1.2 V(vs SCE)下阴极还原产生3-氯-1,4-二取代-主要产品为2(1H)-喹啉酮(1)。当反应在-0.8 V(vs SCE)下进行时,3,3-二氯-4-羟基-1,4-二取代-3,4-二氢-2(1H)-喹啉酮(2)和1,4形成-二取代-1,4-二氢喹啉-2,3-二酮(3)。2和3在氢氧化钠水溶液中的环收缩导致形成3-羟基-1,3-二氢吲哚-2-酮(5)。提出了最合理的反应机理。