A new methodology based on the Eschenmoser coupling reaction has been developed for the preparation of quinoline anhydro bases. Its application has allowed the synthesis of 4-alkylidene-N-methylquinolines in two steps from N-methyl-4-quinolinethione (1) via appropriately 4-thiosubstituted quinolinium salts. Starting from 4(1H)-quinolinethione (6) itself, this process, combined with the Menschutkin reaction, is further demonstrated by the preparation of variously N-substituted 4-alkylidenequinolines. It is believed this route should provide access to pyridine and other quinoline anhydro bases.
基于埃申莫塞尔偶联反应的新方法已经开发出来,用于制备
喹啉脱
水碱。通过这种方法,可以从N-甲基-4-
喹啉硫酮(1)出发,通过适当的4-
硫代
喹啉盐,分两步合成4-亚甲基-N-甲基
喹啉。从4(1H)-
喹啉硫酮(6)本身出发,结合门舒
金反应,通过制备各种N-取代的4-亚甲基
喹啉,进一步证明了这种方法。据信,这种方法应该可以用于制备
吡啶和其他
喹啉脱
水碱。