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2-(4H-4-Oxo-benzopyran-3-yl)benzothiazolium Salts. Synthesis, Reactions and Plant Growth Activity
1 , 2 , 2 , 3 , * 2
1  Department of Chemistry, Faculty of Natural Sciences, University of St. Cyril and Methodius, Námestie Jozefa Herdu 2, Sk-917 01 Trnava, Slovakia
2  Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University, SK-842 15 Bratislava, Slovakia
3  Department of Plant Physiology, Faculty of Natural Sciences, Comenius University, SK-842 15 Bratislava, Slovakia

Abstract: One-pot and facile preparation of novel 2-(4H-4-oxo-benzopyran-3-yl)benzothiazolium salts 3 is described using the fast condensation of 3-formylchromones 1 with 3-benzyl-2-methylbenzothiazolium (or benzoxazolium) bromides 2. Reactions under microwave irradiation, in comparison with classical reactions, proceeded significantly faster and with high yields. Reaction of benzothiazolium salts with secondary and primary amines was also studied. Synthesized chromone derivatives stimulated significantly the growth of the radicle and the hypocotyl at concentrations of 0.1 and 1 ppm, respectively.
Keywords: chromones; benzoxazolium salts; microwave synthesis; aldol reactions; 3-Formylchromones; plant growth activity

 
 
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