Efficient microwave-assisted multi-step synthesis of 8H-quinazolino[4,3-b]quinazolin-8-one was investigated. The synthesis involved two Niementowski condensations from anthranilic acids. Homogeneous or heterogeneous conditions were studied with the aim to develop convenient syntheses of the desired compounds. (C) 2003 Elsevier Science Ltd. All rights reserved.
Singh,S.; Narang,K.S., Indian Journal of Chemistry, 1971, vol. 9, p. 406 - 407