“…Buchwald, Deng, Zhang, Wu, Zhu, Xu, and Hwang described some elegant [5 + 1] annulations of N -arylamidines with aldehydes, DMSO, sulfoxonium ylides, cyclopropenones, isonitriles, or terminal alkynes to obtain quinazolines . Furthermore, Fan and co-workers found a [5 + 2] annulation of N -aryl amidines with propargylic esters to produce 1,3-benzodiazepines . In addition, the Ma team presented an oxidative annulation of N -arylamidines with N , N -dimethylethanolamine as a C1 synthon to construct a 1,2-dihydro-1,3,5-triazine skeleton .…”