反应详情

Ethyl 1-(5-amino-2,4-difluorophenyl)-7-chloro-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate (500 mg) was added to a mixture of 10 ml of 1,2-dichloroethane, 5 ml of methanol and 0.5 ml of acetic acid together with 100 mg of 37% formalin. Using 0.08 g of 10% palladium on carbon, hydrogenation was carried out for 16 hours. After the catalyst was filtered off, the filtrate was concentrated in vacua. The residue was dissolved in 50 ml of chloroform, washed with an aqueous solution of 50% sodium carbonate, dried over anhydrous magnesium sulfate, and then concentrated in vacua. The residue was subject to chromatography using 20 g of silica gel (eluting solution: chloroform) to give 150 mg of the title compound.

1. filtrationAfter the catalyst was filtered off
2. concentrationthe filtrate was concentrated in vacua
3. dissolutionThe residue was dissolved in 50 ml of chloroform
4. washwashed with an aqueous solution of 50% sodium carbonate
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated in vacua