Lithium hydroxide, monohydrate → 4-((tert-butoxycarbonylamino)methyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylic acid

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Lithium hydroxide monohydrate (0.556 g, 13.26 mmol) was added to ethyl 4-((tert-butoxycarbonylamino)methyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylate (Intermediate 11) (1.07 g, 2.65 mmol) in water (6.25 ml), THF (25 ml) and ethanol (25.00 ml). The resulting solution was stirred at 20° C. for 1 day. The reaction mixture was diluted with EtOAc (20 mL) and washed with water (20 mL). The aqueous was adjusted to pH5 with 1M citric acid solution then extracted with EtOAc (3×50 mL). The organic extracts were washed with saturated brine (25 mL) then dried over MgSO4, filtered and evaporated to afford desired product 4-((tert-butoxycarbonylamino)methyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylic acid (0.628 g, 63.1%) as a white foam.

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