Sodium Formate → 3-(1H-benzimidazol-2-yl)-1H-indazole-5-carboxaldehyde

Participants

Reaction Conditions

Reaction Steps

3-(1H-benzimidazol-2-yl)-5-iodo-1H-indazole (500 mg, 1.39 mmol) was dissolved in DMF (5 mL), then Pd(PPh3)2Cl2 (24 mg, 0.034 mmol) and sodium formate (142 mg, 2.1 mmol) were added. The reaction mixture was put under vacuum and recharged with CO three times, then heated up to 90° C. for 4 hr. The mixture was diluted with EtOAc, washed with brine, dried and concentrated. The crude product was purified by flash chromatography to afford 3-(1H-benzimidazol-2-yl)-1H-indazole-5-carboxaldehyde (135 mg, 37%) as yellow solid.

Provenance & Evidence