Potassium Carbonate → N-[1-{[4-(Aminosulfonyl)phenyl]methyl}-4-(methyloxy)-1H-indazol-3-yl]-5-chloro-2-thiophenesulfonamide

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Reaction Steps

5-Chloro-N-[4-(methyloxy)-1H-indazol-3-yl]-N-({[2-(trimethylsilyl)ethyl]oxy}methyl)-2-thiophenesulfonamide (for a preparation see Intermediate 8) (1.734 g, 3.66 mmol) was dissolved in DMF (2.4 mL) and an aliquot (0.1 mL, 0.15 mmol) added to 4-(bromomethyl)benzenesulfonamide (APAC Pharm) (0.15 mmol) and potassium carbonate (0.15 mmol) added last. The tubes were capped and shaken. Stood at room temperature for 18 h, more potassium carbonate (excess) added and reshaken the tubes. Filtered through alltech tube to remove inorganic solids, and washed tubes with MeOH (1 mL) and blown to dryness under a stream of nitrogen in a Radley's blow down unit. Redissolved in DCM (0.5 mL) and applied to a 10 g silica cartridge, and purified by chromatography on Flashmaster using a gradient of 0-100% DCM-(DCM with 20% EtOAc) over 20 min. The appropriate fractions were combined and evaporated in vacuo using the Genevac. The residue was dissolved in TBAF (1M, 0.5 mL) and heated in a microwave oven (50 Watts, 10 min, at approx 110° C. The sample was purified by MDAP on Atlantis column using Acetonitrile Water with a Formic acid modifier. The solvent was evaporated in vacuo using the Genevac to give the title compound (7.9 mg, 10%) LCMS (System A) RT=0.92 min, ES+ve m/z 513/515 (M+H)+

Provenance & Evidence