ChemInform Abstract: Synthesis and Pyrolysis of Tetrahydro‐1,4‐oxazine‐3,5‐diones and Tetrahydro‐1,4‐thiazine‐3,5‐diones.

Abstract

Synthesis and Pyrolysis of Tetrahydro-1,4-oxazine-3,5-diones and Tetrahydro-1,4-thiazine-3,5-diones. -A range of N-substituted tetrahydrooxazinediones and related thiazinediones (III) (11 examples in all) are synthesized and characterized spectroscopically. Their pyrolysis under f.v.p. conditions takes an unexpected course furnishing N-substituted acetamides (IV) and nitriles (V). A mechanism for the formation of these products is proposed. -(AITKEN, R. A.; FARRELL, D. M. M.; KIRTON, E. H. M.; Chem. Heterocycl. Compd. (N. Y.) 37 (2001) 12, 1526-1531; Sch. Chem., Univ.