Synthesis and reactions of 4-trifluoromethyl-3-cyano pyridine-2(1H)-thione/one derivatives

Abstract

4,4,4-Trifluoro-1-(thiophen-2-yl)butane-1,3-dione was reacted by grinding with cyanothioacetamide and cyanoacetamide under solvent-free conditions at 25 °C to give pyridine-2(1H)thione/one derivatives in excellent yields. These compounds were further reacted by grinding with different halogenated reagents to give 2-S/O-alkyl pyridine derivatives. The latter compounds were utilized for the synthesis of thieno[2,3-b]pyridine, pyrazolopyridine, pyridothienopyrimidine and pyridothienooxazinone derivatives.

Keywords:

• Green synthesis
• grinding
• 3-cyanopyridine-2(1H)thione/one
• thieno[2,3-b]pyridine
• pyridothienopyrimidine
• pyrazolopyridine
• pyridothienooxazinone