Methyl 2-amino-4-(1,1-difluoroethyl)-5-iodobenzoate → 2-amino-4-(1,1-difluoro-ethyl)-5-(2-isopropyl-2H-pyrazol-3-yl)-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-amino-4-(1,1-difluoro-ethyl)-5-iodo-benzoic acid methyl ester (0.809 g, 2.37 mmol) in dioxane (10 mL) were added 1-isopropyl-5-tributylstannanyl-1H-pyrazole (1.14 g, 2.84 mmol) and Pd(PPh3)2Cl2 (170 mg, 0.237 mmol) and the resulting mixture was stirred at 90° C. for 72 h. The solvent was removed in vacuo to afford a dark oil. The crude product was purified by flash chromatography (silica gel, EtOAc/hexanes (0:10 to 3:7)) to give 2-amino-4-(1,1-difluoro-ethyl)-5-(2-isopropyl-2H-pyrazol-3-yl)-benzoic acid methyl ester (141 mg, 0.436 mmol, 18%) ES-MS: m/z 324 [M+H]+, rt 6.39 min.

Provenance & Evidence