An elegantly simple, facile, and robust approach to a scaffold of biological importance, 2,3-dihydroquinazolin-4(1H)-ones, is reported. A catalytic 1 % SnCl₂/microwave-mediated approach afforded access to pure material, collected by cooling and filtration after 20-min microwave irradiation at 120°C. A total of 41 analogues were prepared in isolated yields of 17–99 %. This process was highly tolerant of aliphatic, aromatic, heterocyclic, and acyclic aldehydes, but furan, pyrrole, and thiophene aldehyde reactivity correlated with propensity towards electrophilic addition and/or Diels–Alder addition. As a result, thiophene afforded high yields (80 %) whereas pyrrole carboxaldehyde failed to react. With simple cinnamaldehydes, and in the SbCl₃-mediated reaction, and with α,β-unsaturated aldehydes the equivalent quinazolin-4(3H)-ones, and not the 2,3-dihydroquinazolin-4(1H)-ones, was favoured.

据报道，具有生物学重要性的支架2，3-二氢喹唑啉-4（1 H）-ones是一种优雅，简单，轻便且健壮的方法。1％SnCl ₂催化/微波介导的方法提供了纯净的物质，在120°C的微波照射20分钟后通过冷却和过滤收集。总共制备了41种类似物，分离产率为17–99％。该过程对脂肪族，芳香族，杂环和无环醛具有很高的耐受性，但是呋喃，吡咯和噻吩醛的反应性与亲电子加成和/或Diels-Alder加成的倾向相关。结果，噻吩提供了高产率（80％），而吡咯羧醛没有反应。具有简单的肉桂醛，并在SbCl _3中介导的反应，并与α，β-不饱和醛等价的喹唑啉-4（3 H）-一个，而不是2,3-二氢喹唑啉-4（1 H）-一个。