作者:V. Sudhakar Rao、Malleshwar Darbarwar
DOI:10.1055/s-1989-27178
日期:——
A facile route to 2-methyl-4-oxo-4,5-dihydrofuro[3,2-c]quinolines 5a-d has been developed by base-catalyzed thermal rearrangement of 4-(2-propynyl)oxyquinolin-2(1H)-ones 4a-d in good yields. The propynylation of 4-hydroxyquinolin-2(1H)-ones 1a-d furnished 3,3-di(2-propynyl)-2,4-dioxo-1,2,3,4-tetrahydroquinolines 2a-d, 4-(2-propynyl)oxy-3-(2-propynyl)quinolin-2(1H)-ones 3a-d, and 4a-d. A mechanistic pathway for the formation of 5 from 4 via 6 and 7 has been described.
通过碱催化热重排反应,以良好产率实现了4-(2-丙炔基)氧喹啉-2(1H)-酮4a-d合成2-甲基-4-氧-4,5-二氢呋喃[3,2-c]喹啉5a-d的简便路线。4-羟基喹啉-2(1H)-酮1a-d的丙炔基化反应生成了3,3-二(2-丙炔基)-2,4-二氧-1,2,3,4-四氢喹啉2a-d、4-(2-丙炔基)氧-3-(2-丙炔基)喹啉-2(1H)-酮3a-d以及4a-d。通过6和7途径,从4形成5的机理已被描述。