反应详情

To a mixture of [(S)-1-((R)-1-piperidin-3-yl-1H-benzoimidazol-2-yl)ethyl]-(9H-purin-6-yl)amine from Example 16 (150 mg, 0.414 mmol) in anhydrous DCM (3 mL) was added acetone (90 μL, 1.24 mmol) followed by AcOH (1 drop). After stirring for 5 min, sodium triacetoxyborohydride (132 mg, 0.621 mmol) was added and stirring was continued for 22 h. The mixture was then treated with NaOH (1N, 2 mL) and then vigorously stirred for 10 min. Volatiles were removed in vacuo and the resulting residue was purified by column chromatography (Si—PCC, gradient 0-15% 2M NH3/MeOH in DCM) affording 132 (58 mg, 35%). LCMS: RT 1.91 min [M+H]+ 405.1. 1H NMR (DMSO, 400 MHz): δ 12.97 (1H, s), 8.33-8.06 (2H, m), 7.96 (1H, br), 7.72 (1H, d, J=7.33 Hz), 7.62 (1H, d, J=7.14 Hz), 7.24-7.07 (2H, m), 5.93 (1H, s), 4.66-4.52 (1H, m), 3.00-2.83 (2H, m), 2.81-2.65 (2H, m), 2.23 (1H, t, J=11.59 Hz), 2.15-2.01 (1H, m), 1.84-1.57 (5H, m), 1.26-1.07 (1H, m), 0.96 (6H, d, J=6.51 Hz)

1. stirringstirring
2. waitwas continued for 22 h
3. stirringvigorously stirred for 10 min
4. customVolatiles were removed in vacuo
5. customthe resulting residue was purified by column chromatography (Si—PCC, gradient 0-15% 2M NH3/MeOH in DCM)