Dichloromethane → HCID 66924231, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 1-cyclopropyl-6,7-difluoro-8-methoxy-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid (295 mg, 1.0 mmol) in acetonitrile (5 mL) was added 4-(piperidin-4-ylamino)-piperidine-1-carboxylic acid tert-butyl ester (339 mg, 1.2 mmol) followed by the addition of 8-diazabicyclo[5.4.0]undec-7-ene (DBU, 182 mg, 1.2 mmol). The resulting stirred solution was then heated in a 60-65° C. oil bath for two days. The cooled reaction mixture was filtered through a fritted funnel. The filtrate was condensed to dryness. Dichloromethane was added into this residue and washed with water twice. The resulting organic layer was washed one more time with saturated brine and dried over sodium sulfate. The solvent was removed under reduced pressure to give crude material as light brown syrup. This crude product was further purified with 10% methanol in dichloromethane by preparative TLC plate to afford pure title product as yellow solid (100 mg). ESI MS m/z 559 (M+H+); 1H NMR (400 MHz, CDCl3) δ 8.73 (s, 1H), 7.76 (d, J=12.4 Hz, 1H), 3.98 (m, 3H), 3.71 (s, 3H), 3.51 (d, J=12.1 Hz, 2H), 3.17 (t, J=12.3 Hz, 2H), 2.76 (br s, 1H), 1.92 (d, J=11.8 Hz, 2H), 1.83 (d, J=11.6 Hz, 2H), 1.49 (q, J=8.6 Hz, 2H), 1.38 (s, 9H), 1.20 (q, J=7.9 Hz, 2H), 1.15 (d, J=7.1 Hz, 2H), 0.94 (d, J=5.6 Hz, 2H).

Provenance & Evidence