STUDIES IN THE ALLO- AND ISOALLOXAZINE SERIES. XII. NEW SYNTHESIS OF 7-CHLOROALLOXAZINE
A new synthesis of 7-chloroalloxazine is effected by condensing 4-chloro-O-phenylenediamine with violuric acid in 3 N HCl. The same starting materials when condensed together in 50% acetic acid give 6-chloro-2-hydroxyquinoxaline-3-carboxylic acid ureide. Authors: V. M. Berezovskii, G. D. Glebova. English Translation in Chemistry of Heterocyclic Compounds , 1965, 1 (1), pp 83-85 http://link.springer.com/article/10.1007/BF01168929