1-(1-Methylethyl)-1H-pyrazole-5-carbonyl chloride (152 mg) in DCM (10 ml) was added dropwise to 1-(phenylsulfonyl)-6-(trimethylstannanyl)-1H-indazol-4-amine (350 mg) in DCM (15 ml) and pyridine (0.07 ml). The reaction was stirred at room temperature for 10 min before addition of further 1-(1-methylethyl)-1H-pyrazole-5-carbonyl chloride (10 mg). The reaction was stirred for 30 min, saturated sodium bicarbonate (aq) (25 ml) was added and stirred vigorously for 10 min before the DCM was separated through a hydrophobic frit and evaporated to dryness. The residue was dissolved in DCM and loaded onto a silica cartridge preconditioned with cyclohexane. The cartridge was eluted with 0-100% ether in cyclohexane. The compound containing fraction was evaporated to dryness to give title compound, 360 mg.
