A method for the preparation of quinoline-5,8-quinones is described with the key step the benzannulation of a dihydropyridyl Fischer carbene complex. The carbene complexes are generated by the standard Fischer method upon metallation of N-Boc protected 1,4-dihydropyridines and their reactions with alkynes to provide 1,4-dihydroquinolines. The latter are converted to quinoline,5,8-quinones by a two-step
描述了一种制备
喹啉5,8-醌的方法,其中关键步骤是
二氢吡啶基
菲舍尔卡宾配合物的苯并环化。卡宾配合物是在N-Boc保护的1,4-
二氢吡啶及其与
炔烃反应生成1,4-二氢
喹啉后,通过标准的Fischer方法生成的。后者通过
硝酸铈铵和三
氟四
氟硼酸的两步氧化过程转化为
喹啉,5,8-醌。