S. Fajgelj, B. Stanovnik, M. Tislér
Jul 1, 1990
Citations
0
Influential Citations
4
Citations
Journal
Journal of Heterocyclic Chemistry
Abstract
Acylation of 4-alkoxycarbonyl-3-amino-6-hydroxy-2H-1-benzopyran-2-one derivatives (I) gave under mild conditions the O-substituted derivatives , N,O-disubstituted derivative and N,N-disubstituted derivative . The compound I was transformed with benzoyl chloride under more drastic conditions into a derivative of a new heterocyclic system 2-benzopyrano[3,4-d][1,3]oxazin. The derivatives of 1-benzopyrano[3,4-d]pyrimidine were prepared from I through the corresponding N-heteroarylformamidines and N-heteroarylformamide oximes or by cyclization of thiourea derivative .