Formaldehyde → 3-iodo-1-(1-methyl-3-piperidyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

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Reaction Steps

To a mixture of 3-iodo-1-(3-piperidyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (0.4 g, 0.00116 mol) and sodium triacetoxyborohydride (0.34 g, 0.00162 mol) in dichloroethane (30 mL) was added formaldehyde solution (37% in water, 0.035 mL, 00.00128 mol, 1.1 eq.) at room temperature. The mixture was stirred at room temperature under an atmosphere of nitrogen for 18 hours. Additional formaldehyde solution (37% in water, 0.035 mL, 0.00128 mol, 1.1 eq.) was added, and the mixture was stirred at room temperature for 2 hours. A 5 N aqueous solution of sodium hydroxide (5 mL) was added to the mixture. The solvent was removed under the reduced pressure. The residue was partitioned between water and dichloromethane. The aqueous layer was extracted with dichloromethane (3×150 mL). The combined organic extracts were washed with water, and brine, and dried over magnesium sulfate. The solvents were evaporated under the reduced pressure, and the mixture was lyophilized to yield 3-iodo-1-(1-methyl-3-piperidyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (0.41 g, 0.0011 mol). RP-HPLC (Delta Pak C18, 5 μm, 300 A, 15 cm; 5%-95% acetonitrile-0.1M ammonium acetate over 10 min, 1 mL/min) Rt 6.0 min. MS: MH+ 359

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