1-Alkyl- and (±)-1,2-Dialkyl-2,3-dihydro-1,8-naphthyridin-4(1<i>H</i>)-ones by a Tandem Michael–S<sub>N</sub>Ar Annulation Reaction
作者:Richard A. Bunce、Scott T. Squires、Baskar Nammalwar
DOI:10.1021/jo3018632
日期:2013.3.1
A tandem Michael–SNAr annulation reaction has been developed for the synthesis of 1-alkyl and (±)-1,2-dialkyl-2,3-dihydro-1,8-naphthyridin-4(1H)-ones. Treatment of 1-(2-chloropyridin-3-yl)prop-2-en-1-one (R = H) or (E or Z)-1-(2-chloropyridin-3-yl)but-2-en-1-one (R = CH3) with R′NH2 in DMF at 50 °C for 24 h provides 2,3-dihydro-1,8-naphthyridin-4(1H)-ones in 65–85% yields. Mechanistic studies suggest
一种串联迈克尔-S Ñ的Ar环反应已被开发用于1-烷基的合成和(±)-1,2-二烷基-2,3-二氢-1,8-二氮杂萘-4(1H) -酮。1-(2-氯吡啶-3-基)丙-2-烯-1-酮(R = H)或(E或Z)-1-(2-氯吡啶-3-基)丁-2-烯的处理在DMF中在50°C的条件下,用R'NH 2在DMF中的-1- 1(R = CH 3)提供2,3-二氢-1,8-萘啶-4(1H)-1 ,产率为65-85%。机理研究表明,反应序列是由迈克尔加成到侧链烯酮上而引发的。