Unexpected Annulation between 2-Aminobenzyl Alcohols and Benzaldehydes in the Presence of DMSO: Regioselective Synthesis of Substituted Quinolines
作者:Tonglin Yang、Zhi-wen Nie、Miao-dong Su、Hui Li、Wei-ping Luo、Qiang Liu、Can-Cheng Guo
DOI:10.1021/acs.joc.1c01850
日期:2021.11.5
alcohols, benzaldehydes, and DMSO to quinolines has been disclosed. For the reported annulation between 2-aminobenzyl alcohols and benzaldehydes, the change of the solvent from toluene to DMSO led to the change of the product from the diheteroatomic cyclic benzoxazines to monoheteroatomic cyclic quinolines. This annulation can be used to synthesize regioselectively different substituted quinolines
2-氨基苯甲醇、苯甲醛和 DMSO 与喹啉发生了意想不到的环化反应。对于已报道的 2-氨基苯甲醇和苯甲醛之间的环化反应,溶剂从甲苯变为 DMSO 导致产物从二杂原子环状苯并恶嗪变为单杂原子环状喹啉。通过选择不同的 2-氨基醇、醛和亚砜作为底物,这种环化可用于合成区域选择性不同的取代喹啉。有趣的是,将取代基引入亚砜的 α 位会导致产物喹啉中苯甲醛和亚砜之间的位置互换。在对照实验和文献的基础上,提出了一种合理的环化机制。