Inverse-electron-demand [4+2] cycloaddition of photogenerated aza-<i>ortho</i>-quinone methides with 1,3,5-triazinanes: access to perfluoroalkylated tetrahydroquinazolines
A methyleneimine compound represented by the general formula:
wherein R is phenyl, alkyl-substituted phenyl or hydroxymethyl is produced by thermally decomposing a hexahydrotriazine compound represented by the general formula:
wherein R has the same meaning as defined above, at 130° to 220°C, preferably in the presence of a catalyst of an amine salt, a quaternary ammonium salt, or at least one of mono-to tri-valent metal salts of an organic acid or an inorganic acid.
通式为:其中 R 为苯基、烷基取代苯基或羟甲基的亚甲基亚胺化合物,是由通式为:其中 R 的含义与上文所定义的相同的六氢三嗪化合物在 130°至 220°C,最好是在胺盐、季铵盐或有机酸或无机酸的单价至三价金属盐中的至少一种催化剂存在下,通过热分解制得的。
Base-induced inverse-electron-demand aza-Diels-Alder reaction of azoalkenes and 1,3,5-triazinanes: Facile approaches to tetrahydro-1,2,4-triazines
作者:Chaofan Wang、Ling Fang、Zhiyong Wang
DOI:10.1016/j.tetlet.2021.153303
日期:2021.8
The base-induced an inverse-electron-demand aza-Diels-Alder reaction of in situ formed 1,2-diaza-1,3-dienes with formaldimines is reported. This protocol features cycloaddition of two in situ generated reactive intermediates and provides a reliable and practical method for the synthesis of tetrahydro-1,2,4-triazine derivatives in synthetically useful yields.