11H-Indolo[3,2-c]quinoline-6-carboxylic acids are prepared in moderate yields from paullones [7,12-dihydroindolo[3,2-d][1]benzazepin-6(5H)-ones] by reaction with molecular oxygen in the presence of N-hydroxyphthalimide and cobalt(II) acetate. A reaction mechanism is suggested comprising initial autoxidation reaction with subsequent ring contraction.
通过 paullones [7,12-二氢吲哚并[3,2-d][1]苯并氮杂-6(5H)-酮]反应以中等收率制备 11H-吲哚[3,2-c]喹啉-6-羧酸在 N-羟基邻苯二甲酰亚胺和乙酸钴 (II) 存在下与分子氧反应。建议的反应机制包括最初的自氧化反应和随后的环收缩。