Facile and One-Pot Synthesis of 1,2-Dihydroquinazolin-4(3<i>H</i>)-ones via Tandem Intramolecular Pinner/Dimroth Rearrangement
作者:Jian-Hong Tang、Da-Xin Shi、Li-Jun Zhang、Qi Zhang、Jia-Rong Li
DOI:10.1080/00397910902908822
日期:2010.2.12
method for the preparation of quinazolin-4-one derivatives was designed. The facile condensation of aromatic o-aminonitriles with aromatic aldehydes catalyzed by Lewis acid give 1,2-dihydroquinazolin-4(3H)-ones in moderate to good yields under refluxing dimethylformamide.
A modified Friedländer conversion of the cyclocondensation of aromatic o‐aminonitriles with carbonyl compounds was discovered. Systematic studies reveal that both the new transformation and the classic Friedländer annulation in the presence of ZnCl2 constitute a pair of divergent reaction, and thecontrolled PDF transformation of this divergent reaction was achieved in the present of bases.