Guanidine Hydrochloride → HCID 178450672, compound

Participants

Reaction Steps

To a solution containing 0.11 g of sodium in 30 ml of anhydrous tert.-butanol is added 0.45 g of guanidine hydrochloride. After stirring the mixture at room temperature for 15 minutes, 0.35 g of methyl 5-(4-tert.-butoxycarbonylphenyl)ethynyl-2-chloro-3-pyridinecarboxylate is added in one portion. The mixture is heated under reflux under nitrogen for 4 hours, cooled, diluted with ethanol, and the solvent removed under reduced pressure. The residue is dissolved in water and filtered to remove a small amount of insoluble material. The filtrate is acidified with a 3N hydrochloric acid solution and the precipitate that forms is collected by filtration, washed with water, and dried under reduced pressure to give 0.15 g (44%) of 2-amino-4-hydroxy-6-(4-tert.-butoxycarbonylphenylethynyl)pyrido[2,3-d]pyrimidine as a pale yellowish solid: m.p. >260° C.; NMR (DMSO-d6, 80 MHz) delta 1.55 (s, 9H), 7.71 (d, 2H, J=8.6 Hz), 7.96 (d, 2H, J= 8.6 Hz), 8.36 (d, 1H, J=2.5 Hz), 8.73 (d, 1H, J=2.5 Hz).

Provenance & Evidence