反应详情

A solution of 6.8 g (31.5 mmol) 2-cyano-5-nitrobenzotrifluoride in 200 ml ethanol was hydrogenated at atm. pressure by using 0.4 g 5% Pd-C as a catalyst. The reaction mixture was filtered and evaporated in vacuo. The crude product was dissolved in 150 ml dry tetrahydrofuran and added 6.0 ml (43.6 mmol) dry triethylamine. A solution of 4.4 ml (39.4 mmol) ethyl oxalylchlorid in 30 ml dry tetrahydrofuran was added dropwise, and then stirring was continued at 25° C. for 3 h. The filtered and evaporated reaction product was stirred with ethanol-water to give 7.3 g (82%) of 2-cyano-5-ethoxalylaminobenzotrifluoride. M.p. 112-114° C.

1. filtrationThe reaction mixture was filtered
2. customevaporated in vacuo
3. dissolutionThe crude product was dissolved in 150 ml dry tetrahydrofuran
4. filtrationThe filtered
5. customevaporated
6. customreaction product