A One-Step Synthesis of 2,4-Unsubstituted Quinoline-3-carboxylic Acid Esters from <i>o</i>-Nitrobenzaldehydes
作者:Hariharan Venkatesan、Frances M. Hocutt、Todd K. Jones、Michael H. Rabinowitz
DOI:10.1021/jo100392x
日期:2010.5.21
straightforward and efficient one-step procedure for the synthesis of 2,4-unsubstituted quinoline-3-carboxylic acid ethyl esters is described. The simple reductive cyclization is carried out by treating various substituted o-nitrobenzaldehydes with inexpensive, commercially available 3,3-diethoxypropionic acid ethyl ester and SnCl2·2H2O in refluxing ethanol.