N-(2-{[(1,1-Dimethylethyl)(dimethyl)silyl]oxy}ethyl)-2,4-difluoro-N-(phenylmethyl)benzenesulfonamide (291 mg, 0.66 mmol) was added to 3-hydroxy-N-(1-methyl-1H-pyrazol-3-yl)-5-{(s)-1-methyl-2-[(triisopropylsilyl)oxy]ethoxy}benzamide (296 mg, 0.66 mmol) and potassium carbonate (183 mg, 1.31 mmol) in dry DMA (4 mL). The mixture was heated in a Smith Creator microwave at 150° C. for 45 mins. Water (25 mL) was added to the reaction mixture and extracted with ethyl acetate (3×30 mL). The combined organic extracts were dried (MgSO4), filtered and evaporated. Purification by column chromatography on silica, eluting with 80-90% ethyl acetate in isohexane, afforded the title compound as a colourless oil (450 mg). 1H NMR δ (CDCl3): 1.25 (d, 3H), 2.16-2.19 (m, 1H), 3.53 (t, 2H), 3.68-3.71 (m, 2H), 3.74 (s, 3H), 4.14 (t, 2H), 4.18 (s, 2H), 4.50 (ddd, 1H), 6.70 (d, 1H), 6.72 (d, 1H), 6.75 (t, 1H), 6.78 (dd, 1H), 7.09 (t, 1H), 7.22 (ddd, 1H), 7.24-7.26 (m, 1H), 7.28-7.29 (m, 5H), 7.78 (d, 1H), 8.45 (s, 1H). m/z 579 (M+H)+
