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