The synthesis of benzofuroquinolines. I. Some benzofuro[2,3-<i>b</i>]quinoline and benzofuro[3,2-<i>c</i>]quinoline derivatives
作者:Yoshiyuki Kawase、Seiji Yamaguchi、Osamu Maeda、Akemi Hayashi、Ichihiro Hayashi、Kazuko Tabata、Masako Kondo
DOI:10.1002/jhet.5570160315
日期:1979.4
Benzofuro[2,3-b]quinoline (Ia) and its 11-methyl derivative (Ib) were synthesized by demethylcyclization of 3-(o-methoxyphenyl)-1,2-dihydroquinolin-2-ones (VIa,b). Benzofuro[2,3-b]quinoline-11-carboxylic acid (Id) was synthesized by chlorination followed by the action of potassium hydroxide of a lactone (IX) prepared by demethyl-cyclization of 3-(o-methoxyphenyl)-2-oxo-1,2-dihydroquinoline-4-carboxylic
通过3-(邻甲氧基苯基)-1,2-二氢喹啉-2-酮(VIa,b)的脱甲基环化反应合成苯并呋喃[2,3- b ]喹啉(Ia)及其11-甲基衍生物(Ib)。苯并呋喃[2,3 - b ]喹啉-11-羧酸(Id)通过氯化反应,然后通过3-(邻甲氧基苯基)-2-的甲基环化反应制得的内酯(IX)的氢氧化钾作用合成氧代1,2-二氢喹啉-4-羧酸(VIII)。异构苯并呋喃[3,2-c]喹啉(Ha)及其6-甲基衍生物(IIb)是通过3-(o-甲氧基苯基)-1,4-二氢喹啉-4-酮(XIa,b)。通过与苯甲醛缩合,然后氧化,将两种甲基衍生物(Ib和IIb)都转化为羧酸(Id和IId)。由此获得的苯并呋喃喹啉(Ia,b,d和IIa,b)被氧化成相应的N-氧化物(IIIa,b,d和IVa,b)。