Cl.[I:2][C:3]1[C:11]2[C:6](=[N:7][CH:8]=[N:9][C:10]=2[NH2:12])[N:5]([CH:13]2[CH2:17][CH2:16][NH:15][CH2:14]2)[N:4]=1.C=O.[C:20](O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(O)(=O)C>ClC(Cl)C>[I:2][C:3]1[C:11]2[C:6](=[N:7][CH:8]=[N:9][C:10]=2[NH2:12])[N:5]([CH:13]2[CH2:17][CH2:16][N:15]([CH3:20])[CH2:14]2)[N:4]=1To a solution of rac-3-iodo-1-tetrahydro-1H-3-pyrrolyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine monohydrochloride (0.400 g, 1.09 mmol) in dichloroethane (10 mL) was added formaldehyde (37% in water, 0.12 mL, 1.63 mmol), sodium triacetoxyborohydride (0.578 g, 2.73 mmol), and acetic acid (0.37 mL, 6.55 mmol). The reaction mixture was stirred at room temperature for 3 days and then additional formaldehyde (37% in water, 0.12 mL, 1.63 mmol), sodium triacetoxyborohydride (0.578 g, 2.73 mmol), and acetic acid (0.37 mL, 6.55 mmol) were added. The reaction mixture stirred for an additional 3 h and was then concentrated to afford rac-3-iodo-1-(1-methyltetrahydro-1H-3-pyrrolyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine as a pale yellow solid (0.639 g) which was used in subsequent reactions without further purification. RP-HPLC Rt 4.226 min, 96% purity (5% to 85% acetonitrile/0.1M aqueous ammonium acetate, buffered to pH 4.5, over 20 min at 1 mL/min; λ=254 nm; Deltapak C18, 300 Å, 5 μm, 150×3.9 mm column); m/z 345 (MH+).
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