Formic Acid → 2,4-Diamino-5-propylpyrido[2,3-d]pyrimidine-6-carboxaldehyde

Participants

Reaction Steps

Raney Ni (1.2 g damp) was added with the aid of 95-97% HCO2H (7 mL) to a solution of 2,4-diamino-5-propylpyrido[2,3-d]pyrimidine-6-carbonitrile (I-4a) (500 mg, 2.19 mmol) in 95-97% HCO2H (5 mL). The stirred mixture was heated at 75°-80° C. for 1.5 h. Raney Ni was removed by filtration, and the filtrate was evaporated. The residue was dissolved in hot H2O (20 mL), and the solution was filtered, then cooled, and treated with concentrated NH4OH to pH 7 to cause solid to precipitate. The mixture was kept at 0°-5° C. overnight before the solid was collected and washed with cold H2O. This crude material was applied to a silica gel column and eluted with CHCl3 --MeOH (7:1). Evaporation of the product fractions afforded the aldehyde compound 2,4-diamino-5-propylpyrido[2,3-d]pyrimidine-6-carboxaldehyde; yield 8% (41 mg).

Provenance & Evidence