Sodium hydride → 3-(1-Methyl-5-triphenylmethylaminopyrazol-4-yl)acrylonitrile

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Reaction Steps

To a suspension of sodium hydride (55% dispersion in mineral oil, 26.2 g, 600 mmol) in tetrahydrofuran (1000 ml) was added diethyl(cyanomethyl)phosphonate (106.3 g, 600 mmol) under ice-cooling. The mixture was stirred under ice-cooling for 20 minutes. To the mixture was added 1-methyl-5-triphenylmethylaminopyrazole-4-carbaldehyde (197 g, 530 mmol), and the mixture was stirred for 2 hours. The reaction mixture was poured into ice-cold water. The mixture was extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was triturated with diethyl ether to give 3-(1-methyl-5-triphenylmethylaminopyrazol-4-yl)acrylonitrile (E, Z mixture, 126 g) as a solid.

Provenance & Evidence