Inverse‐Electron‐Demand [4+2]‐Cycloaddition of 1,3,5‐triazinanes: Facile Approaches to Tetrahydroquinazolines
作者:Yongsheng Zheng、Liang Tu、Na Li、Rong Huang、Tao Feng、Huan Sun、Zhenghui Li、Jikai Liu
DOI:10.1002/adsc.201801063
日期:2019.1.11
unprecedented inverse‐electron‐demand [4+2] cycloaddition reaction of in situ generated aza‐o‐quinone methides with 1,3,5‐triazinanes has been developed under mild conditions, providing an efficient and mild approach to synthesize tetrahydroquinazolines in high yields (up to 99%) with excellent functional group tolerance. This protocol represents the first example of inverse‐electron‐demand [4+2] cycloaddition
原位生成的氮杂邻苯醌甲基化物与1,3,5-三嗪并酮的空前逆电子需求[4 + 2]环加成反应在温和的条件下得到了发展,提供了一种高效且温和的方法来在高温下合成四氢喹唑啉产率(高达99%),具有出色的官能团耐受性。该协议代表了1,3,5-三嗪酮的逆电子需求[4 + 2]环加成反应的第一个示例。