反应详情

10% Palladium-carbon (2.5 g) was added to a mixture of methyl 4-chloro-3-methylsulfonyl-5-nitrobenzoate (9.5 g) and triethylamine (5.0 ml) in methanol (150 ml) and tetrahydrofuran (100 ml), and the mixture was subjected to catalytic reduction at ambient temperature under atmospheric pressure. The catalyst was removed by filtration and the filtrate was evaporated in vacuo. To the residue was added a mixture of ethyl acetate and water, and adjusted to pH 9 with 20% aqueous potassium carbonate solution. The separated organic layer was washed with brine, dried over magnesium sulfate and evaporated in vacuo. The residue was triturated with diisopropyl ether to give methyl 5-amino-3-methylsulfonylbenzoate (5.85 g).

1. customwas subjected to catalytic reduction at ambient temperature under atmospheric pressure
2. customThe catalyst was removed by filtration
3. customthe filtrate was evaporated in vacuo
4. additionTo the residue was added
5. additiona mixture of ethyl acetate and water
6. washThe separated organic layer was washed with brine
7. dry with materialdried over magnesium sulfate
8. customevaporated in vacuo
9. customThe residue was triturated with diisopropyl ether