D. Azarifar, D. Sheikh
Jul 1, 2012
Citations
0
Influential Citations
17
Citations
Journal
Helvetica Chimica Acta
Abstract
A convenient approach to 2,2′-(1,4-phenylene)bis[1-acetyl-1,2-dihydro-4H-3,1-benzoxazin-4-one] derivatives 4 was explored employing the one-pot condensation of anthranilic acids (=2-aminobenzoic acids) 1 with terephthalaldehyde (=benzene-1,4-dicarboxaldehyde; 2) under ultrasound-irradiation conditions (Scheme 1). The reactions proceeded smoothly in the presence of excess Ac2O in the absence of any other catalyst and solvent to afford the respective products in high yields.