反应详情

To 1 part of a solution of 2 parts of thiophene in 40 parts of ethanol were added 15 parts of 2-chloro-N-(2-methyl-4-nitrophenyl)acetamide and 400 parts of methanol. The whole was hydrogenated at normal pressure and at room temperature with 2 parts of platinum-on-charcoal catalyst 5%. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated. The solid residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was suspended in 2,2'-oxybispropane. The product was filtered off and dried, yielding 12 parts (92%)of N-(4-amino-2-methylphenyl)-2-chloroacetamide (intermediate 70).

1. filtrationthe catalyst was filtered off
2. customthe filtrate was evaporated
3. customThe solid residue was purified by column-chromatography over silica gel using
4. additiona mixture of trichloromethane and methanol (95:5 by volume) as eluent
5. customThe pure fractions were collected
6. customthe eluent was evaporated
7. filtrationThe product was filtered off
8. customdried