反应详情

温度

100 °C

A mixture of 5-amino-1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxoquinoline-3-carboxylic acid (1.50 g, 5.39 mmol), β-alanine ethyl ester hydrochloride (2.48 g, 16.1 mmol) and triethylamine (4.50 mL, 32.3 mmol) in anhydrous DMSO (30 mL) was stirred at 100° C. for 10 h. After cooling, the reaction mixture was poured into ice-water (50 mL) and acidified with 1M HCl. The product was extracted with EtOAc, washed with water and brine, dried over Na2SO4 and concentrated in vacuo. Trituration of the residue with MeOH (30 mL) gave 5-amino-1-cyclopropyl-7-[2-(ethoxycarbonyl)ethylamino]-6-fluoro-1,4-dihydro-8-methoxy-4-oxoquinoline-3-carboxylic acid (1.54 g, 70%) as a yellow solid.

1. temperatureAfter cooling
2. extractionThe product was extracted with EtOAc
3. washwashed with water and brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated in vacuo