2008

Benzopyran derivativesR 0350 Unusual Conversion of Substituted-3-formylchromones to 3-(5-Phenyl-

-3H-[1,2,4]dithiazol-3-yl)chromen-4-ones: A Facile and Efficient Route to Novel 1,2,4-Dithiazoles. — The thermal reaction of substrates (I) with thiobenzylamidine (II) or thiobenzamide (IV) affords the biologically interesting 1,2,4-dithiazoles (III) instead of the expected chromanothiazines (V). — (RAJ, T.; ISHAR*, M. P. S.; GUPTA, V.; PANNU, A. P. S.; KANWAL, P.; SINGH, G.; Tetrahedron Lett. 49 (2008) 2, 243-246; Dep. Pharm. Sci., Guru Nanak Dev Univ., Amritsar 143 005, India; Eng.) — Mais

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