Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester → HCID 19093694, compound

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Reaction Steps

A mixture of compound C (1.1 g) and (carbethoxymethylene)triphenylphosphorane (6 g) in xylene (200 ml) was stirred and heated at reflux for 4 hours. The solution was then concentrated by evaporation and a solution of sodium (2.6 g) in methanol (200 ml) was added. The mixture was stirred and heated at reflux for 4 hours. Volatile material was removed by evaporation and water was added to the residue. The mixture was then acidified by the addition of concentrated hydrochloric acid and extracted twice with ether. The ether extracts were discarded. The aqueous phase was basified with solid potassium carbonate and extracted twice with ethyl acetate. The combined extracts were washed with water, saturated sodium chloride solution and dried (MgSO4). Solvent was removed by evaporation to leave a residue which was recrystallised from acetone to give 5,7-diethyl-4-methyl-1,6-naphthyridin-2(1H)-one (D) (0.31 g) as a solid, m.p. 220°-223° C.; NMR (d6 -DMSO): 1.22(t, 3H), 1.24(t, 3H), 2.62(s, 3H), 2.69(q, 2H), 3.16(q, 2H), 6.33(s, 1H), 6.91(s, 1H), 11.68(s, 1H); mass spectrum (CI, ammonia): 217 (M+H)+ ; microanalysis, found: C, 71.5; H, 7.1; N, 12.9%; C13H16N2O requires: C, 72.2; H, 7.5; N, 13.0%.

Provenance & Evidence