Condensations of Aromatic Amines with Formaldehyde in Media Containing Acid. V. Substituted Dihydroquinazolines from p-Chloroaniline and p-Bromoaniline
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