Oxone-mediated annulation of 2-aminobenzamides and 1,2-diaminobenzenes with<i>sec</i>-amines<i>via</i>imine-<i>N</i>-oxides: new syntheses of 2,3-dihydroquinazolin-4(1<i>H</i>)-ones and 1<i>H</i>-benzimidazoles
An efficient and mild method for the preparation of 2,3-dihydroquinazolin-4(1H)-ones and 1H-benzimidazoles by the oxone-mediated reaction of sec-amines via imine-N-oxides with 2-amino-N-substituted benzamides and 1,2-diaminobenzenes respectively in THF–water (2 : 1) at ambient temperature is described.