Ammonium Chloride → 3-Chloro-5-{[5-chloro-1-({1-(4-methoxybenzyl)-6-[(4-methoxybenzyl)amino]-1H-pyrazolo[3,4-b]pyridin-3-yl}methyl)-1H-indazol-4-yl]oxy}benzonitrile

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Reaction Steps

3-chloro-5-[(5-chloro-1H-indazol-4-yl)oxy]benzonitrile (0.677 g, 2.225 mmol) and lithium tert-butoxide (0.178 g, 2.225 mmol) were dissolved in DMF (5 μL) and allowed to stir for 5 minutes. To this mixture at 0° C. was added 3-(chloromethyl)-N,1-bis(4-methoxybenzyl)-1H-pyrazolo[3,4-b]pyridin-6-amine (Intermediate 2; 0.896 g, 2.119 mmol) as a solution in DMF (5 mL). The mixture was then allowed to warm to room temperature overnight, after which aqueous ammonium chloride (20 mL) was added and the mixture was extracted with ethyl acetate (2×50 mL). The combined organic fractions were washed with water (5×50 mL), dried over MgSO4, filtered and concentrated under reduced pressure. The resulting residue was subjected to automated silica gel chromatography eluting with a gradient of 0-10% ethyl acetate in dichloromethane to yield the title product. LRMS (M+1)=691.8

Provenance & Evidence