Dimethylformamide → 4-(tert-butyl)-N-[3-{2-[(5-formyl-2-pyrimidinyl)oxy]ethoxy}-1-methyl-4-(4-methylphenyl)-1H-pyrazol-5-yl]benzenesulfonamide

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Reaction Conditions

Reaction Steps

To N-[3-{2-[(5-bromo-2-pyrimidinyl)oxy]ethoxy}-1-methyl-4-(4-methylphenyl)-1H-pyrazol-5-yl]-4-(tert-butyl)benzenesulfonamide (Example 3) (332 mg) in tetrahydrofuran (10 ml) at −78° C. under an atmosphere of nitrogen was added n-butyllithium in hexanes (0.69 ml of 1.6M). Dimethylformamide (86 μl) was added dropwise to the solution after 20 minutes of stirring at −78° C. After a further 20 minutes of stirring at −78° C., the mixture was quenched with saturated ammonium chloride solution (2 ml). The mixture was diluted with ammonium chloride (50 ml), extracted with ethyl acetate (50 ml), dried over magnesium sulphate, filtered and the filtrate was evaporated to dryness. Purification of the residue by column chromatography on silica gel (32 g), eluting with an ethyl acetate:hexane gradient (1:1 to 3:1) yielded the title compound as a cream solid (52 mg).

Provenance & Evidence