Diethyl Ether → HCID 19093683, compound

Participants

Reaction Steps

Potassium hydroxide (0.112 g) was added to a solution of methyl 4-[(5,7-diethyl-2-oxo-1,2-dihydro-1,6-naphthyridin-1-yl)-methyl]benzoate (A) (0.35 g) in ethanol (10 ml) and the mixture was heated at reflux for 90 minutes. Volatile material was removed by evaporation and the residue was dissolved in a minimum of water which was then acidified with acetic acid. Ether was added to the mixture and the solid which crystallised was collected by filtration. Further solid was obtained by adding petroleum ether to the ether phase of the filtrate. The combined solids were recrystallised from ethyl acetate/petroleum ether to give 4-[(5,7-diethyl-2-oxo-1,2-dihydro-1,6-naphthyridin-1-yl)-methyl]benzoic acid (0.175 g), as a solid, m.p. 143°-146° C.; NMR (CDCl3): 1.21(t, 3H), 1.35(t, 3H), 2.79(q, 2H), 3.12(q, 2H), 5.56(s, 2H), 6.77(s, 1H), 6.80(d, 1H), 7.30(d, 2H), 7.81(d, 1H), 8.05(d, 2H); mass spectrum (CI. ammonia): 337 (M+H)+ ; microanalysis, found: C, 71.3; H, 6.3; N, 7.9%; C20H20N2O3 requires: C, 71.4; H, 6.0; N, 8.3%.

Provenance & Evidence