Ethanol → Sodium 3-cyano-6-oxo-1-phenyl-1,6-dihydropyridine-2-thiolate

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Reaction Steps

A solution of sodium methoxide in MeOH (30 wt %, 202.2 g) was added to absolute EtOH (360 ml), followed by 1,3-dimethyluracil (75 g) and 2-cyano-N-phenylthioacetamide (Adhikari et al., Australian J. Chem., 1999, 52, 63-67) (90 g). The resulting mixture was heated at reflux for 8 h and then allowed to cool to ambient temperature overnight. The reaction mixture was then cooled to +5° C. and maintained at this temperature for at least an hour when the product was recovered by filtration. The filter cake was washed with cold (+5° C.) absolute ethanol (450 ml) and then dried to constant weight under vacuum at 45° C. to give the title compound as a pale pink solid (130.0 g). The product thus obtained contained residual EtOH and MeOH, estimated at 12.2 wt % by 1H nmr, corresponding to a corrected yield of 114.1 g. δH (DMSO-d6) 7.32 (2H, m), 7.27-7.18 (1H, m), 7.16 (1H, d, J 9.1 Hz), 6.92 (2H, m), 5.63 (1H, d, J 9.1 Hz). LCMS (Conditions B) (ES+) RT 2.43 minutes, 229 (M+H)+.

Provenance & Evidence