Synthesis of 4-Pyridinylquinolines via Sugasawa and Friedlander Reaction from 4-Cyanopyridine with Anilines and Ketones
作者:Zhenming Zhang、Chi Liu、Zhilin Yang、Jiangyu Ji、He Li、Lili Man、Runlai Li
DOI:10.2174/1570178620666230214100138
日期:2023.2.14
Firstly, 2-amino aromatic ketones were synthesized by o-acylation ofp-substituted anilines with nitrile under Sugasawa conditions, and the yield was up to 90.1%. Then, 4-pyridinylquinoline derivatives were synthesized by Friedlander reaction with α-methylene ketones, and the yield was up to 81.9%. The structures of five 2-amino aromatic ketones and eighteen substituted quinolines were characterized
首先,在Sugasawa条件下,将对位苯胺与腈邻位酰化合成了2-氨基芳酮,收率高达90.1%。然后,通过Friedlander反应与α-亚甲基酮合成了4-吡啶基喹啉衍生物,收率高达81.9%。五种 2-氨基芳香酮和十八种取代的喹啉的结构通过 MS、1H NMR 和 13C NMR 进行了表征。通过单晶X射线衍射进一步证实了结构,与预期结构一致。分析晶体结构,发现化合物4j和4q分别为单斜晶系,空间群为P21/n。化合物2c、2d、2e和4n分别为P-1空间群的三斜晶系结晶。其中化合物4n在三斜空间群P-1中结晶,在不对称单元中有两个结晶学上独立但化学等价的分子。发现这两个独立的分子相对于核心(喹啉)双环系统具有不同的氯、甲基、吡啶基和乙酰基取向。这项工作为制备 4-吡啶基喹啉衍生物提供了一种简单、直接的合成方案。