One-step synthesis of 4-methyl-2-substituted quinazoline-3-oxides via polyphosphoric acid catalyzed acylation of electron-rich anilides with nitroethane
作者:Igor Yu Grishin、Alexander V. Aksenov、Nicolai A. Aksenov、Yuriy I. Grishin、Alexander V. Leontiev、Dmitrii A. Aksenov
DOI:10.1016/j.tet.2023.133784
日期:2024.1
A diverse set of 4-methyl-2-substituted quinazoline-3-oxides has been prepared using polyphosphoric acid both as a reaction medium and a Brønsted-acid catalyst. The reaction proceeds in a domino fashion via the formation of a corresponding oxime followed by exo-trig cyclization and elimination of a water molecule which leads, ultimately, to the target N-oxide heterocycles.
使用多磷酸作为反应介质和布朗斯台德酸催化剂,制备了多种 4-甲基-2-取代的喹唑啉-3-氧化物。该反应以多米诺骨牌方式进行通过形成相应的肟,然后形成exo-trig 环化并消除水分子,最终形成目标N-氧化物杂环。