HCID 69360103, compound → HCID 45095359, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 1-ethyl-4-nitro-1H-indazole-6-carboxylate (D198) (2.2 g, 8.8 mmol, 1 equiv) in MeOH (100 ml) and H2O (10 ml) was added 10% palladium on charcoal (50% wet, 700 mg, 16% w/w) and the resulting mixture was stirred at 60° C. for 30 min then cooled to room temperature. The catalyst was removed by filtration through a pad of celite and most of the solvent removed in vacuo. The residue was partitioned between AcOEt and a saturated aqueous NaHCO3 solution and the two layers were separated. The organic phase was dried over MgSO4 and concentrated in vacuo. The residue was triturated with iso-hexane to give methyl 4-amino-1-ethyl-1H-indazole-6-carboxylate (D199) (1.55 g, 80%) which was used in the next step without further purification. [M+H]+=220.1, RT=3.31 min.

Provenance & Evidence