Hydrochloric Acid → N-[(3-{[3-{[(5-Chloro-2-thienyl)sulfonyl]amino}-6-fluoro-4-(methyloxy)-1H-indazol-1-yl]methyl}phenyl)methyl]-2-hydroxy-2-methylpropanamide

Participants

Reaction Conditions

Reaction Steps

N-[1-{[3-(Aminomethyl)phenyl]methyl}-6-fluoro-4-(methyloxy)-1H-indazol-3-yl]-5-chloro-2-thiophenesulfonamide (for a preparation see Intermediate 54) (100 mg, 0.208 mmol) (intermediate) was dissolved in dichloromethane (0.5 mL) and pyridine (0.5 mL), and then treated with 2-chloro-1,1-dimethyl-2-oxoethyl acetate (0.031 mL, 0.218 mmol). The mixture was stirred for 2 h. LCMS showed starting material remaining so more 2-chloro-1,1-dimethyl-2-oxoethyl acetate (0.021 mL, 0.146 mmol) was added to the reaction mixture and stirred for 1.5 hr. LCMS showed starting material remaining so a further portion of 2-chloro-1,1-dimethyl-2-oxoethyl acetate (0.015 mL, 0.104 mmol) was added to the reaction and stirred for 1.25 h. The reaction mixture was concentrated under a stream of nitrogen to leave a yellow residue, which was dissolved in methanol (1 mL) and potassium carbonate (86 mg, 0.624 mmol) was added to the solution. The reaction mixture was heated to 40° C. for 1 hand then neutralised with 2M HCl and concentrated in vacuo. The residue was dissolved in ethyl acetate (50 mL), washed three times with water (50 mL) and once with brine (50 mL). The organic layer was dried over anhydrous magnesium sulfate before being evaporated in vacuo to leave a yellow residue. The sample was dissolved in 1:1 MeOH-DMSO (1 mL) and purified by Mass Directed AutoPrep on Sunfire C18 column using Acetonitrile Water with a TFA modifier (Method B). The solvent was evaporated in vacuo to give the title compound (60 mg, 51%). LCMS (System A) RT=1.04 min, ES+ve m/z 481/483 (M+H)+.

Provenance & Evidence