Four identical reactions were carried out in a 20 ml microwave vial, each using one quarter of the quantities stated. They were then combined for work-up and purification. A solution of a quarter of 1-(phenylsulfonyl)-6-(trimethylstannanyl)-1H-indazol-4-amine (4.329 g, 9.93 mmol) in a quarter of DMF (24 ml) was treated with a quarter of N-(5-bromo-2-chloro-3-pyridinyl)methanesulfonamide (3.26 g, 11.42 mmol) followed by a quarter of Pd(PPh3)4 (1.032 g, 0.893 mmol). Each vial was heated at 120° C. for 50 mins in a Biotage Initiator. The orange solutions were combined and loaded onto a 20 g silica cartridge, and the vials washed with methanol (10 ml) which was also loaded onto the cartridge which was then eluted with methanol. Then eluants were evaporated to leave an orange oil. This was diluted with DCM (10 ml) and loaded directly and evenly onto 2×100 g silica cartridges. These were eluted with 0-100% ethyl acetate/cyclohexane over 80 mins using the Flashmaster II. Appropriate pure fractions were combined and evaporated to give the title compound as a yellow solid (0.939 g).
