Hydrazine hydrate (1:1) → HCID 22258870, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of tert-butyl 3-{6-[2-(benzyloxy)phenyl]-2-bromo-3-formyl-4-pyridinyl}-1-piperidinecarboxylate (0.150 g, 0.272 mmol) in 1,4-dioxane (1 mL) was added hydrazine monohydrate (0.5 mL). The reaction mixture was stirred at 90° C. for 15 hrs. After cooled to room temperature, the reaction was quenched with water and extracted with ethyl acetate. The organic phase was dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was recrystallized from diethyl ether to give tert-butyl 3-{6-[2-(benzyloxy)phenyl]-1H-pyrazolo[3,4-b]pyridin-4-yl}-1-piperidinecarboxylate as a white solid (0.030 g, 23%). Then tertbutyl 3-{6-[2-(benzyloxy)phenyl]-1H-pyrazolo[3,4-b]pyridin-4-yl}-1-piperidinecarboxylate was treated in a similar manner as that of the step (2) of Example 1-1 and then the step (3) of Example 1-1 to obtain 2-(4-Piperidin-3-yl-1H-pyrazolo[3,4-b]pyridin-6-yl)-phenol hydrochloride.

Provenance & Evidence