Triethylamine → {2-[(2-Tert-butyl-1,1-dioxido-3-oxo-2,3-dihydro-1,2-benzisothiazol-6-yl)ethynyl]-4-chlorophenoxy}acetic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of (4-chloro-2-ethynylphenoxy)acetic acid (Intermediate 238; 211 mg; 1.00 mmol), 6-bromo-2-tert-butyl-1,2-benzisothiazol-3(2H)-one-1,1-dioxide (prepared as described in Tetrahedron, 2006, 62, 7902-7910, 382 mg; 1.20 mmol), dichlorobis(triphenylphosphine)palladium(II) (70 mg; 0.10 mmol) and cuprous iodide (9.5 mg; 0.05 mmol) in anhydrous THF (4 ml) was degassed for 10 minutes then treated with triethylamine (1.00 ml; 7.21 mmol) and the mixture stirred at 60° C. for 16 h. EtOAc was added and the organic phase washed with a sat. NH4Cl solution then brine. The organic phase was dried on MgSO4, filtered and concentrated under reduced pressure to give a residue which was purified by preparative HPLC to afford the title compound as a white solid.

Provenance & Evidence