New organic nitrates. II. Synthesis of 2H-pyrido[2,3-e]-1,3-oxazine-2,4(3H)-diones, 2H-pyrido[4,3-e]-1,3-oxazine-2,4(3H)-diones, 2H-pyrido[4,3-e]-1,3-oxazin-4(3H)-ones, 2H-thieno[2,3-e]-1,3-oxazin-4(3H)-ones and 2H-thieno[3,4-e]-1,3-oxazin-2,4(3H)-diones
Francesca Benedini, Giorgio Bertolini, Francesco Ferrario, Angelo Motti, Alberto Sala, Flavio Somenzi
Journal of Heterocyclic Chemistry Volume 32, Issue 1, pages 103–107, January/February 1995
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http://dx.doi.org/10.1002/jhet.5570320118