Dimethylamine → 7-(2-(dimethylamino)ethyl)-N-(3-methyl-1-((6-methylpyridin-2-yl)methyl)-1H-indazol-4-yl)imidazo[1,2-a]pyridine-3-carboxamide

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Reaction Steps

A solution of N-(3-methyl-1-((6-methylpyridin-2-yl)methyl)-1H-indazol-4-yl)-7-(2-oxoethyl)imidazo[1,2-a]pyridine-3-carboxamide (33 mg, 0.068 mmol) and dimethylamine (0.34 mL, 0.68 mmol) in 1.4 mL of a 1:1 MeOH/EtOH mixture was treated at ambient temperature with excess (10 equivalents) sodium triacetoxyborohydride. The reaction mixture was stirred overnight at ambient temperature. Another 10 equivalents of sodium triacetoxyborohydride were added, and stirring was continued for a few more hours. The reaction mixture was quenched with an equal volume of saturated, aqueous sodium bicarbonate, and extracted with DCM and EtOAc. The combined organic extracts were dried over anhydrous sodium sulfate, concentrated, and subjected to preparative thin-layer chromatography on silica, with an 8% MeOH-2% 7N NH3/MeOH/DCM mixture as eluent, to afford 6.6 mg of desired product. MS (ES+APCI) m/z=468 (M+H) detected.

Provenance & Evidence