Chemoselective annulation of 1,3-dithiin, -thiazine and -oxathiin rings on thiazoles using a green protocol |
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| Authors: | Lal Dhar S Yadav Vijai K Rai |
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| Institution: | Green Synthesis Lab, Department of Chemistry, University of Allahabad, Allahabad-211 002, India |
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| Abstract: | Tandem Knoevenagel and Michael reactions of 3-arylrhodanines, aromatic aldehydes and ammonium N-aryldithiocarbamates diastereoselectively yield dithioesters, thiazol-5-ylmethyl N-aryldithiocarbamates, under solvent-free microwave irradiation conditions in a one-pot procedure. Under the same conditions, the dithioesters are chemoselectively and expeditiously annulated with montmorillonite K-10 clay, Li+-montmorillonite clay and I2 to give thiazolo-1,3-dithiins, -thiazines and -oxathiins, respectively. |
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| Keywords: | Microwaves Mineral supported Solvent-free Chemoselective annulation Thiazoles |
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