反应详情

A mixture of 0.280 g (0.67 mmole) of 3-[5-carbamoyl-4-(3-chloro-phenyl)-thiazol-2-ylamino]-4-nitro-benzoic acid (VI.10), 0.20 g of 10% palladium on carbon catalyst and 3 mL of 96% formic acid was stirred under an atmosphere of hydrogen at room temperature for 16 hours. The mixture was filtered through Diatomaceous earth and the Diatomaceous earth pad was washed with formic acid. The filtrate was concentrated under reduced pressure and the residue was dissolved in 1 mL of tetrahydrofuran and then added dropwise to 50 mL of water. The solid was collected by filtration, washing with water, to give 0.163 g of 3-[5-carbamoyl-4-(3-chloro-phenyl)-thiazol-2-yl]-3H-benzoimidazole-5-carboxylic acid (I.10a).

1. filtrationThe mixture was filtered through Diatomaceous earth
2. washthe Diatomaceous earth pad was washed with formic acid
3. concentrationThe filtrate was concentrated under reduced pressure
4. dissolutionthe residue was dissolved in 1 mL of tetrahydrofuran
5. additionadded dropwise to 50 mL of water
6. filtrationThe solid was collected by filtration
7. washwashing with water