1-Alkyl-2,3-dihydro-4(1<i>H</i>)-quinolinones by a tandem Michael-S<sub>N</sub>Ar annulation reaction
作者:Richard A. Bunce、Takahiro Nago
DOI:10.1002/jhet.70
日期:2009.7
A tandem Michael-SNAr annulation reaction has been developed for the synthesis of 1-alkyl-2,3-dihydro-4(1H)-quinolinones. Success in the reaction followed expected electronic effects for the final SNAr ring closure. Treatment of doubly activated 1-(2-fluoro-5-nitrophenyl)-2-propen-1-one with primary amines in N,N-dimethylformamide at 50°C for 24 h provided 2,3-dihydro-4(1H)-quinolinones in 67–78% yields
一种串联迈克尔-S Ñ的Ar环反应已被开发用于1-烷基-2,3-二氢-4-(1-合成ħ)-quinolinones。反应的成功遵循了最终的S N Ar环闭合的预期电子效应。双活化治疗1-(2-氟-5-硝基苯基)-2-丙烯-1-酮与伯胺的关系N,N-二甲基甲酰胺在50°C下放置24小时后,可提供67-78%的产率的2,3-二氢-4(1 H)-喹啉酮。单独激活1-(2-氟苯基)-2-丙烯-1-酮的反应相似,但是没有与受阻胺或芳香胺发生最终的闭环。最后,1-(2-氟-5-甲氧基苯基)-2-丙烯-1-酮在环上具有一个活化基团和一个失活基团,仅得到简单的1,4-加成产物。J.杂环化学,(2009)。