Facile Synthesis of Alkyl and Aryl Substituted Dibenzo[<i>b,g</i>][1,8]naphthyridin-5-ones
作者:M. Manoj、K. J. Rajendra Prasad
DOI:10.1080/00397910903399708
日期:2010.10.20
2′-substituted-4-methoxy-2-(N-phenylamino)quinolines. These potential intermediates, on polyphosphoric acid–catalyzed cyclization at two different temperatures, gave the respective 6-methyl and 6-phenyl substituted dibenzo[b,g][1,8]naphthyridin-5-ones. These temperature differences for the formation of the final products were due to the in situ formation of the respective 2′-substituted-2-(N-phenylamino)quinolin-4-ones