Eco‐friendly HClO4–SiO2 catalyzed synthesis of mono‐ and bis‐diaryl‐2h‐1,4 benzothiazines |
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| Authors: | Mohd. Imran Ansari Ravi Shankar Mohd. Kamil Hussain Ruchir Kant Prakash R. Maulik K. Ravi Kumar K. Hajela |
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| Affiliation: | 1. Medicinal and Process Chemistry Division, Central Drug Research Institute, Lucknow 226001, UP, India;2. Molecular and Structural Biology Division, Central Drug Research Institute, Lucknow‐226001, UP, India;3. X‐ray Crystallographic Division, Indian Institute of Chemical Technology, Hyderabad‐500007, AP, India |
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| 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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