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
2,4-二氯喹啉与邻氨基苯乙酮和邻氨基二苯甲酮在纯净条件下反应分别生成 2'-乙酰基和 2'-苯甲酰基取代的-4-氯-2-(N-苯基氨基)喹啉,用甲醇钠得到 2'-取代的-4-甲氧基-2-(N-苯基氨基)喹啉。这些潜在的中间体,在多磷酸催化下在两个不同温度下环化,分别得到 6-甲基和 6-苯基取代的二苯并[b,g][1,8]萘啶-5-酮。形成最终产品的这些温度差异是由于从氯和甲氧基中间体原位形成了各自的 2'-取代的-2-(N-苯基氨基)喹啉-4-酮。naphthyridin-5-ones 进行 N-甲基化,