Methyl chloroformate → HCID 71584705, compound

Participants

Reaction Steps

A mixture of Example 21 (100 mg, 0.221 mmol) in pyridine (3 mL) was treated drop-wise with methylchloroformate (23 mg, 0.243 mmol) and stirred at RT for 4 h. Additional methylchloroformate (50 mL) was added and the mixture stirred overnight. The mixture was treated with additional methylchloroformate (100 mL) and stirred for another 2 days. The mixture was concentrated to dryness, treated with EtOAc and water and the resulting solid collected via filtration. The material was purified via reverse-phase chromatography (MeCN/H2O with 0.1% TFA); the organics were removed under reduced pressure and the aqueous mixture was neutralized with satd. NaHCO3. The resulting solid was collected via filtration, washed with water and dried to afford methyl (3-(2-chloro-4-fluoro-5-(3-phenylureido)phenyl)-1-ethyl-2-oxo-1,2-dihydro-1,6-naphthyridin-7-yl)carbamate (101 mg, 87% yield). 1H NMR (400 MHz, DMSO-d6): δ 10.56 (br s, 1H), 9.31-8.78 (m, 2H), 8.67 (s, 1H), 8.20 (d, J=8.6 Hz, 1H), 7.96 (s, 2H), 7.56 (d, J=11.0 Hz, 1H), 7.42 (d, J=8.0 Hz, 2H), 7.26 (t, J=7.8 Hz, 2H), 6.96 (t, J=7.4 Hz, 1H), 4.20 (q, J=7.2 Hz, 2H), 3.71 (s, 3H), 1.25 (t, J=7.1 Hz, 3H); MS (ESI) m/z: 510.1 [M+H]+.

Provenance & Evidence