Sodium Hydroxide → 4-[2-(tert-Butoxycarbonylamino)ethylamino]-1,3-dimethyl-pyrazolo[3,4-b]pyridine-5-carboxylic acid

Beteiligte Stoffe

Reaktionsschritte

To a solution of ethyl 4-[2-(tert-butoxycarbonylamino)ethylamino]-1,3-dimethyl-pyrazolo[3,4-b]pyridine-5-carboxylate (303 mg, 0.803 mmol) in methanol (30 ml) was added sodium hydroxide (4.02 g, 101 mmol) in water (10 ml) and the resulting mixture was heated at reflux for 1.5 hours. The mixture was allowed to cool to −50° C. after which ammonium chloride (6.07 g, 113 mmol) was added. The mixture was stirred at reflux for 15 minutes after which the solids were filtered off. The solids were washed with ethanol (150 ml) and the combined filtrates were concentrated under reduced pressure to yield 2.32 g of a white solid that was purified by filtration over a pad of silicagel in a glassfilter using 10% (1% AcOH in MeOH) in DCM. The filtrate was concentrated under reduced pressure to yield 240 mg (0.687 mmol, 86%). MS (ESI) m/z=350.2 [M+1]+.

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