Sodium Dithionite → 2-(2-amino-4-trifluoromethyl-phenyl)-5-(3-trifluoromethoxy-phenoxy)-2H-[1,2,3]triazole-4-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 2-[2-nitro-4-(trifluoromethyl)phenyl]-5-[3-(trifluoromethoxy)phenoxy]-2H-1,2,3-triazole-4-carboxylate (i.e. the product of Step F, 0.76 g, 1.5 mmol) in acetonitrile (30 mL) was added a solution of sodium hydrosulfite (1.31 g, 7.5 mmol) in water (20 mL). The mixture was stirred at 23° C. for 2.5 h. The reaction mixture was diluted with saturated aqueous sodium chloride solution (30 mL) and extracted with ethyl acetate (2×50 mL). The organic layer was dried (MgSO4) and concentrated under reduced pressure to afford the title compound (0.70 g) as a pale yellow solid. The title compound was used directly in the next step without further purification.

Provenance & Evidence