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http://dx.doi.org/10.1002/jhet.5570410419Cyclocondensation reaction of heterocyclic carbonyl compounds . The direction of competitive cyclocondensation between carbonyl groups of 6-azauracile and 1,2-dihydro-quinoxalin-2-one cycles
Roman Buchtík, Jan Hlavá, Jan Slouka, Petr Fryák
Journal of Heterocyclic Chemistry, Vol. 41 (4), P. 597 - 599
Заранее большое спасибо!