反应详情

温度

5 °C

A suspension of 0.81 g (3.0 mmole) of 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-1,8 -naphthyridine-3-carboxylic acid, 0.9 g (9.0 mmole) of N-methyl-3-azetidinemethanamine and 30 mL of acetonitrile was refluxed for six hours. The reaction was cooled to 5° C. The filtered solids were washed with acetonitrile, ether, and dried in vacuo. The dried solid was suspended in 70 mL of water and made basic to pH 11.0 after filtering through a fiber glass pad to clarify, the filtrate was acidified to pH 7.4 with 1.0M hydrochloric acid. The resulting precipitate was removed by filtration, washed successively with water, 2-propanol, ether and dried in vacuo to give 270 mg of 1-ethyl-6-fluoro-1,4-dihydro-7-[3-[(methylamino)methyl]-1-azetidinyl]-4-oxo-1,8 -naphthyridine-3-carboxylic acid, mp 180°-182° C.

1. temperaturewas refluxed for six hours
2. washThe filtered solids were washed with acetonitrile, ether
3. customdried in vacuo
4. filtrationafter filtering through a fiber glass pad
5. customThe resulting precipitate was removed by filtration
6. washwashed successively with water, 2-propanol, ether
7. customdried in vacuo