N. V. Sazonov, T. S. Safonova
Feb 1, 1973
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Journal
Chemistry of Heterocyclic Compounds
Abstract
The chlorine atom in 4-chloro-6,7-dihydro-8H-pyrimido[5,4-b][1,4-oxazin-7-ones is replaced by amine residues and mercapto and methoxy groups and can also be removed in the presence of Pd/C. Pyrimidooxazin-7-ones are alkylated in the 8 position, while, depending on the conditions, the 4-mercapto derivatives are alkylated either at the mercapto group or simultaneously at the mercapto group and in the 8 position.