Improved intermolecular hydride transfer using task-specific ionic liquid: a reasonable and environmentally benign approach for the synthesis of bioactive 2H-thiopyran derivatives
摘要:
The present study describes, for the first time, the application of 1-n-butyl-3-methylimidazolium borohydride ([bmim]BH4) as task-specific ionic liquid for highly regioselective reduction of triarylthiopyrylium salts. This method furnished a straightforward route for the synthesis of valuable 2H-thiopyrans derivatives, which are widely present as motifs in an assortment of biologically active molecules, in satisfactory yields, and excellent conversions without any conventional catalyst and organic solvent.[GRAPHICS].