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2005
Thiazine derivatives
R 0610
Synthesis and Transformations of 5-Substituted 2-Aryl-7H-[1,2,4]triazoand 2-Aryl-2,3-dihydro-4H-[1,3]thiazino[3,2-a]benz36- 163 lo[3,2-b][1,3]thiazin-7-ones
imidazol-4-ones. — The reactivity of the title triazolothiazinones (IX) (8 examples),
synthesized by condensation of triazolethiones (VII) with alkynoates (VIII), towards
various electrophilic agents is studied and compared with the reactivity of title thiazinobenzimidazolones (I). Both heterocyclic systems tend to undergo transformations accompanied by opening of the thiazine ring. However, triazolothiazinones (IX) are significantly more resistant to electrophilic agents. — (BRITSUN, V. N.; ESIPENKO, A.
N.; CHERNEGA, A. N.; LOZINSKII, M. O.; Russ. J. Org. Chem. 41 (2005) 1,
108-113; Inst. Org. Chem., Natl. Acad. Sci. Ukr., Kiev 02094, Ukraine; Eng.) —
R. Staver
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