The new 2-amino-3-R-4-aryl-6-ethyl-4,6-dihydropyrano[3,2-c][2,1] benzothiazine 5,5-dioxides were synthesized via three-component interaction of 1H-2,1-benzothiazin-4(3H)-one 2,2-dioxide with arylcarbaldehydes and active methylene nitriles.
Abstract:The present account summarizes the author's studies to elucidate the mechanisms of the recently reported rearrangements resulting from inter-and/or intramolecular reactions of 2-imino-2H-chromene-3-carboxamides with different dinucleophiles.
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