1-Methyl-5-(tributylstannyl)-1H-pyrazole → 2-Amino-4-difluoromethyl-5-(2-methyl-2H-pyrazol-3-yl)-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-amino-4-difluoromethyl-5-iodo-benzoic acid methyl ester (750 mg, 2.29 mmol) in dioxane (30 mL) were added 1-methyl-5-tributylstannanyl-1H-pyrazole (1.28 g, 1.5 equiv) and Pd(PPh3)2Cl2 (246 mg, 0.15 equiv) and the resulting mixture was stirred at 90° C. for 18 h. The solvent was removed in vacuo to afford a dark oil. The crude product was purified by flash chromatography (silica gel, EtOAc/hexanes (0:100 to 50:50)) to provide the title compound as a yellow oil (200 mg, 31%). ES-MS: m/z 282.3 [M+H]+, rt 4.97 min.

Provenance & Evidence