3,4-Diaminopyridine → HCID 178478056, compound

Participants

Reaction Conditions

Reaction Steps

6-Chloropyridine-2-carboxylic acid (2.00 g, 12.7 mmol), 3,4-diaminopyridine (1.52 g, 14.0 mmol) and DIPEA (2.43 mL, 14.0 mmol) were dissolved in DMF (20 mL) and HBTU (5.29 g, 14.0 mmol) was added. The reaction mixture was stirred for 48 h and concentrated in vacuo. The residue was dissolved in EtOAc (100 mL), washed with 1 M aq Na2CO3 (2×100 mL), water (100 mL), dried (MgSO4) and concentrated in vacuo. The residue was purified by column chromatography, dissolved in AcOH and heated at 120° C. for 50 min. The solvent was removed in vacuo and the residue was suspended in 1 M aq Na2CO3 (50 mL) and extracted with EtOAc (5×50 mL). The combined organic fractions were dried (MgSO4) and concentrated in vacuo. The residue was purified by column chromatography and recrystallisation from MeOH to give the title compound (534 mg, 37%) as a white solid.

Provenance & Evidence