[Cl:1][C:2]1[C:10]2[C:5](=[N:6][C:7]([O:12][CH2:13][C:14]([O:16]CC)=[O:15])=[CH:8][C:9]=2[CH3:11])[N:4]([CH3:19])[N:3]=1.O.[Li+].[OH-]>O1CCOCC1>[Cl:1][C:2]1[C:10]2[C:5](=[N:6][C:7]([O:12][CH2:13][C:14]([OH:16])=[O:15])=[CH:8][C:9]=2[CH3:11])[N:4]([CH3:19])[N:3]=1To a solution of Ethyl 2-((3-chloro-1,4-dimethyl-1H-pyrazolo[3,4-b]pyridin-6-yl)oxy)acetate in dioxane (5 ml) were added H2O (2.5 ml) and LiOH (111 mg, 4.65 mmol). After 2 h, more water was added and the mixture extracted with CH2Cl2. Then, the aqueous phase was acidified by drop wise addition of conc. HCl until the product precipitated. The title compound (580 mg, 98%) was filtered off and dried under reduced pressure. [1H-NMR (DMSO-d6, 400 MHz) δ 6.62 (s, 1H), 4.98 (s, 2H) 3.84 (s, 3H), 2.61 (s, 3H); HPLC-MS RtJ=0.81 min; [M+H]+=255.9, 258.0]
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