Abstract
Mono- and bis-diaryl-2H-1,4-benzothiazines were obtained in quantitative yields through silica-supported perchloric acid catalyzed reaction cascade of double condensation and 1,4 addition of diaroylacetylenes with 2-aminothiophenol at room temperature. The structures were confirmed by spectroscopic analyses and X-ray crystallographic studies. J. Heterocyclic Chem., (2011)
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