Diisopropylamine → 2-(2-Chlorophenylamino)-3,4-difluoro-6-trimethylsilanylethynylbenzoic acid methyl ester

Participants

Reaction Steps

A mixture of 6-bromo-2-(2-chlorophenylamino)-3,4-difluorobenzoic acid methyl ester (2.61 g, 6.93 mmol), TMS-acetylene (1.18 mL, 8.32 mmol), Pd(PPh3)2Cl2 (496 mg, 0.693 mmol), CuI (132 mg, 0.693 mmol), and i-Pr2NH (1.95 mL, 13.9 mmol) in THF (11 mL) was stirred for 16 hours at room temperature. The reaction mixture was concentrated in vacuo, diluted with EtOAc, and washed with saturated aqueous NH4Cl and brine. The organic layer was dried over MgSO4, filtered, and concentrated to give the crude material that was purified by silica gel flash column chromatography (100% hexanes to 1% to 2% EtOAc in hexanes) to afford the desired product (2.15 g, 79%).

Provenance & Evidence