To a solution of 6-bromo-1-methyl-1H-pyrazolo[4,3-b]pyridine (20 mg, 0.094 mmol) in dioxane (2 mL) was added bis(pinacolato)diboron (29 mg, 0.113 mmol), [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with dichloromethane (8 mg, 0.0094 mmol), potassium acetate (19 mg, 0.189 mmol). The mixture was degassed and heated at 100° C. for 2 h. The mixture was cooled, and then added (S)-2-(2-bromo-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethyl pivalate (25 mg, 0.046 mmol), tetrakis(triphenylphosphine)palladium(0) (6 mg, 0.005 mmol), K2CO3 (33 mg, 0.23 mmol) and water (0.3 mL, degassed). The reaction mixture was heated at 90° C. for 1 h, cooled and partitioned between ethyl acetate and brine. The organic layer was separated, dried over Na2SO4, filtered and concentrated to give crude product which was purified by chromatographic column to afford the desired product. LCMS-ESI+: calc'd for C32H35ClN4O3S: 591.22 (M+H+); Found: 591.2 (M+H+).
