Lithium Hydroxide → 4-(tert-Butoxycarbonylamino)-1-(6-(5-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-c]pyridin-3-yl)pyridin-2-yl)piperidine-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 240 mg (0.39 mmol) of methyl 4-(tert-butoxycarbonylamino)-1-(6-(5-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-c]pyridin-3-yl)pyridin-2-yl)piperidine-4-carboxylate and 3 ml of 1 M aqueous solution of lithium hydroxide in 20 ml of methanol and 10 ml of tetrahydrofuran was stirred for 18 hours at room temperature and 2 hours at 60° C. The mixture was concentrated in vacuum, neutralized to pH 5 by careful addition of 1 N aqueous HCl and extracted with ethyl acetate. The organic extracts were washed with water, brine, dried over MgSO4 and concentrated to afford 150 mg (43%) of 4-(tert-Butoxycarbonylamino)-1-(6-(5-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-c]pyridin-3-yl)pyridin-2-yl)piperidine-4-carboxylic acid over two steps. ESI MS m/z 600.2 (M+1).

Provenance & Evidence