Triethylamine → 5-Amino-1-cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-7-(4-methylamino-3,3-dimethyl-1-piperidinyl)-4-oxo-quinoline-3-carboxylic Acid

Participants

Reaction Conditions

Reaction Steps

A suspension of 5-amino-1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxo-quinoline-3-carboxylic acid (0.17 g, 0.55 mmol), 3,3-dimethyl-4-methylamino piperidine (0.15 g, 1.06 mmol) and triethylamine (1 g, 10 mmol) in a mixture of dimethylsulfoxide (10 ml) and acetonitrile (10 ml) was heated at 70° C. for 18 hr. Acetonitrile was distilled off, filtered to remove suspended impurities, diluted with water (5 ml). The precipitate thus separated was filtered, washed with water, dried and purified by silicagel column chromatography. Elute from a mixture of ethyl acetate and methanol furnished the required product. Yield 0.12 g (50%), m.p.250° C. (decomp.), C22H29FN4O4, m/z 433 (M+1), PMR (DMSO-d6): 0.9 (m, 2H), 1.0 (m, 2H), 1.0 (s, 3H), 1.1 (s, 3H), 1.8-2.0 (m, 2H), 2.6 (s, 3H), 2.8-3.2 (m, 4H), 3.5 (s, 3H), 3.6 (s, 3H), 3.65 (m, 1H), 4.0 (m, 1H), 7.2 (bs, 2H, D2O exchangeable), 8.6 (s, 1H).

Provenance & Evidence