反应详情

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.

1. temperaturecooling
2. temperaturecooling for 20 minutes
3. stirringthe mixture was stirred for 2 hours
4. additionThe reaction mixture was poured into ice-cold water
5. extractionThe mixture was extracted with ethyl acetate
6. dry with materialThe extract was dried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was triturated with diethyl ether