Acetic Acid → HCID 178508854, compound

Participants

Reaction Steps

A suspension of 1.0 g of 2,4-diamino-6[2-(4-carboxyphenyl)ethenyl]pyrido[2,3-d]pyrimidine in 30 mL of 1N aqueous sodium hydroxide was heated under reflux under nitrogen for 3 hours. The resulting homogenous orange solution was cooled to room temperature, acidified with 6 mL of glacial acetic acid, and the resulting yellow precipitate collected by filtration. The filter cake was washed successively with water, methanol, acetone and ether and was then dried under reduced pressure to give 0.88 g (88%) of the title compound as a microcrystalline yellow powder, mp>250° C.; NMR (TFA-dl delta 6.8, 7.25 (AB q, 2H, J=12 Hz), 7.45, 8.2 (AB q, 4H, J=9 Hz), 8.55 (s, 1H), 8.85 (s, 1H); IR (Nujol) 3500-2500 (br), 1670, 1625, 1600 cm-1.

Provenance & Evidence