HCID 59699605, compound → HCID 59699556, compound

Participants

Reaction Steps

A solution of 1-(4-methoxybenzyl)-4-chloro-1,2-dihydro-2-oxo-1,8-naphthyridine-3-carbonitrile (32) (326 mg, 1 mmol) in TFA was refluxed for 24 h. The solution was cooled and excess TFA was distilled off under reduced pressure. The residue was taken in water, basified by solid NaHCO3 and filtered. The solids were washed with excess water and dried to yield 197 mg (95%) of 4-chloro-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carbonitrile (31) as white solids. MP: 310° C.; 1H-NMR (DMSO-d6): δ 7.58 (dd, J=4.4, 8.0 Hz, 1H), 8.50 (d, J=2.0, 8.0 Hz, 1H), 8.83 (dd, J=4.4, 1.6 Hz, 1H), 13.03 (s, 1H); EIMS: 206 (M+1).

Provenance & Evidence