1,1-Dimethylethyl 3-{[(3-hydroxy-5-{[(1S)-1-methyl-2-(methyloxy)ethyl]oxy}phenyl) carbonyl]amino}-1H-pyrazole-1-carboxylate (145 mg, 0.5 mmol), 3-[(2,4,5-trifluorophenyl)sulfonyl]dihydrofuran-2(3H)-one (140 mg, 0.5 mmol) and potassium carbonate (138 mg, 2 mmol) in acetonitrile (4 mL) were heated at 130° C. for 1 hour then 160° C. for a further 1 hour in a microwave reactor. Water was added to the reaction mixture and the phases separated. The aqueous phase was extracted with ethyl acetate (3×20 mL), and the combined organics washed with 1M hydrochloric acid, a saturated sodium bicarbonate solution, brine, dried (MgSO4), filtered and evaporated. The residue was chromatographed on alumina, eluting with 0-10% methanol in DCM, to give the desired compound as a white solid (58 mg).
