Ultrasound-promoted catalyst-free synthesis of 2,2′-(1,4-phenylene) bis[1-acetyl-1,2-dihydro-4H-3,1-benzoxazin-4-one] derivatives

Article abstract of DOI:10.1002/hlca.201100481

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-dicarboxalde