反应详情

10 Grams of diethyl 2-acetylamino-2-(2-nitro-3-methylbenzyl)malonate and 1 g of 10% Pd-C were suspended in 50 ml of acetic acid, and the suspension was catalytically reduced under 3 to 3.5 atmospheric pressure at 60° to 70° C. by hydrogenation. After the hydrogenation was finished, the catalyst was removed by filtration, and the solvent was removed by evaporation. The residue thus obtained was recrystallized from ethanol to obtain 2.7 g of ethyl 3-acetylamino-8-methyl-3,4-dihydrocarbostyril-3-carboxylate. White powdery substance. Melting point: 236.5°-238.5° C.

1. customwas catalytically reduced under 3 to 3.5 atmospheric pressure at 60° to 70° C. by hydrogenation
2. customthe catalyst was removed by filtration
3. customthe solvent was removed by evaporation
4. customThe residue thus obtained
5. customwas recrystallized from ethanol