2-Methyl-1,3-thiazole-4-carboxylic acid was dissolved in THF (0.2 ml) and (1-chloro-2-methyl-1-propen-1-yl)dimethylamine (0.013 ml, 0.1 mmol) was added. The mixture was shaken, then left to stand for 30 mins. 3-fluoro-6-{6-fluoro-1-[(4-nitrophenyl)sulfonyl]-1H-indol-4-yl}-1-(phenylsulfonyl)-1H-indazol-4-amine (0.1 mmol) was dissolved in THF (0.4 ml) and added to the reaction mixture, followed by pyridine (0.016 ml, 0.2 mmol). The reaction mixture was shaken and then left to stand for 1 hour. A further portion of 2-methyl-1,3-thiazole-4-carboxylic acid was dissolved in THF (0.2 ml) and (1-chloro-2-methyl-1-propen-1-yl)dimethylamine (0.013 ml, 0.1 mmol) was added. The mixture was shaken, then left to stand for 20 mins before being added to the ongoing reaction mixture above, along with further pyridine (0.097 ml, 1.2 mmol). The mixture was shaken and left to stand for 30 mins. A further portion of 2-methyl-1,3-thiazole-4-carboxylic acid was dissolved in THF (0.2 ml) and (1-chloro-2-methyl-1-propen-1-yl)dimethylamine (0.013 ml, 0.1 mmol) was added. The mixture was shaken, then left to stand for 20 mins before being added to the ongoing reaction mixture above, along with further pyridine (0.097 ml, 1.2 mmol). The mixture was shaken and left to stand for 30 mins, then evaporated by blow down under a stream of nitrogen. The crude reaction mixture was dissolved in isopropanol (0.3 ml) and NaOH (2M aqueous, 0.3 ml) was added. The mixture was stood for 60 h at room temperature. Further NaOH (2M aqueous, 0.3 ml) was added and the mixture was heated to 80° C. for 1 hour. The reaction mixture was neutralised with HCl (2 M, aq.) and blown down under a stream of nitrogen. The crude material was dissolved in DMSO (0.5 ml), filtered and purified by Mass Directed Auto Prep on an Xbridge column using Acetonitrile/Water with a formic acid modifier (Method F). The solvent was evaporated in vacuo using the Genevac. The residue was dissolved in DMSO (0.5 ml) and further purified by formic acid MDAP (as above), over an extended run time. The product-containing fractions were blown down under a stream of nitrogen to give the title compound (11 mg). LCMS (Method D) Rt=1.16 min, MH+=410.
