反应详情

Thionyl chloride (0.010 mL, 0.14 mmol) was added dropwise to a suspension of 2-[4-(Benzyloxy)phenyl]-1-cyclohexyl-N′-hydroxy-1H-benzimidazole-5-carboximidamide (0.025 g, 0.057 mmol, see above for preparation) and pyridine (0.020 mL, 0.25 mmol) in tetrahydrofuran (2 mL) at 0° C. The resulting solution was stirred for 3 h, and then concentrated on a rotary evaporator. As starting material remained, the residue was resubjected to the reaction conditions (0.020 mL thionyl chloride and 0.040 mL pyridine). The residue was purified by reverse phase HPLC (C18 column, water/acetonitrile gradient containing 0.05% trifluoroacetic acid) to afford the product as a yellow solid (0.011 g, 32%). 1H NMR (CD3OD) δ 8.32 (d, 1H, J=8.8 Hz), 8.25 (s, 1H), 8.04 (d, 1H, J=8.8 Hz), 7.77 (d, 2H, J=9.1 Hz), 7.49 (d, 2H, J=6.6 Hz) 7.43-7.35 (m, 5H), 5.27 (s, 2H), 4.55 (m, 1H), 2.45 (m, 2H), 2.15 (m, 2H), 2.00 (m, 2H), 1.80 (m, 1H), 1.44 (m, 3H); ESI-MS m/e 487.3 (M+1); HPLC purity (ELSD)>95%.

1. concentrationconcentrated on a rotary evaporator
2. customthe residue was resubjected to the reaction conditions (0.020 mL thionyl chloride and 0.040 mL pyridine)
3. customThe residue was purified by reverse phase HPLC (C18 column, water/acetonitrile gradient containing 0.05% trifluoroacetic acid)