反应详情

The preparation of 4-phenylquinazolines from an N-benzylideneaniline type of Schiff base that is formed from aniline and benzaldehyde, as shown in the reaction between p-chloro-(α-chlorobenzylidene)aniline and benzonitrile in 1,4-dichlorobenzene at 140° C. in the presence of AlBr3 that afforded 69% of 6-chloro-2,4-diphenylquinazoline [23], and the reaction between N-[o-(triphenylphosphoranylideneamino)benzylidene]-p-toluidine and p-nitrobenzaldehyde when refluxed in xylene for 12 hours that gave 70% of 6-methyl-4-p-nitrophenyl-2-phenylquinazoline [24]. The latter reaction would afford dihydroquinazolines as well if other benzaldehydes rather than p-nitrobenzaldehyde are used. In addition, the reaction between 3,4-diphenyl-1,2,4-oxadiazol-5(4H)-one and benzylideneaniline also afforded 2,4-diphenylquinazoline [25];