反应详情

A suspension of 77.5 g. of N-ethyl-2,6-dimethoxy-4-(methoxy-carbonyl)-carbanilic acid benzyl ester in 1 liter of methanol was hydrogenated in the presence of 2 g. of palladium on carbon (5%) until hydrogen uptake ceased. The suspension was heated to boiling and filtered. The filtrate was evaporated under vacuum. After recrystallization of the residue from cyclohexane, there was obtained 4-(ethylamino)-3,5-dimethoxy-benzoic acid methyl ester having a melting point of 50°-51° C.

1. additionA suspension of 77.5 g
2. temperatureThe suspension was heated
3. filtrationfiltered
4. customThe filtrate was evaporated under vacuum
5. customAfter recrystallization of the residue from cyclohexane