Efficient synthesis of 2,4-disubstituted thiazoles and 2-substituted 4-thiazolidinones under solvent free conditions
作者:Deepika Gautam、Poonam Gautam、Ram P. Chaudhary
DOI:10.1515/hc.2011.027
日期:2011.1.1
Condensation of thiosemicarbazones 2 derived from 1-tetralones (1) with chloroacetic acid in presence of N-methylpyridinium tosylate (an ionic liquid) yields 2-substituted-4-thiazolidinones 3. The reaction of 2 with alpha-halo carbonyl compounds at room temperature under grinding conditions yields 2,4-disubstituted thiazoles 4 in excellent yields. The structures of compounds 2-4 have been established on the basis of elemental analysis, IR, NMR and mass spectral data.