BF<sub>3</sub> ⋅ OEt<sub>2</sub> and Visible Light‐Controlled [3,3]‐ or [1,3]‐Rearrangement of Quinazolinone N−O Aryl Moieties
作者:Shu‐Min Nie、Lu‐Min Cheng、Chun‐Hua Chen、Cui Liang、Cheng‐Xue Pan、Dong‐Liang Mo
DOI:10.1002/adsc.202301345
日期:——
[3,3]‐ or [1,3]‐rearrangements. The N‐O aryl moieties of aryloxyquinazolinium salts were found to undergo solely [3,3]‐rearrangement with heating whereas [1,3]‐rearrangement occurred via a radical process under irradiation of visible light. This method highlights the formation of aryloxyquinazolinium salts based on the use of BF3·OEt2 and visible light to prompt [1,3]‐rearrangement generating atropisomeric
我们描述了 N3-羟基喹唑啉酮与二芳基碘鎓盐和连续 BF3·OEt2 和可见光控制的 [3,3]- 或喹唑啉酮 N-O 芳基部分的 [1,3]-重排制备各种 2-(喹唑啉-4-基氧基)苯酚和阻转异构体 3-(2-羟基苯基)喹唑啉-4-酮,产率 44%-75%和 28%‐70% 的收益率,分别。机理研究表明,BF3·Et2O 和水原位生成 HBF4,在此过程中起催化剂作用,而芳氧基喹唑啉鎓盐是促进该反应的重要中间体[3,3 ]-或[1,3]-重排。研究发现芳氧基喹唑啉鎓盐的 N-O 芳基部分在加热时仅发生 [3,3]-重排,而 [1,3]-重排则在可见光照射下通过自由基过程发生。该方法强调了基于使用 BF3·OEt2 和可见光促进[1,3]-重排生成阻转异构喹唑啉酮的芳氧基喹唑啉鎓盐的形成。