反应详情

To a stirred solution of Example 42 (0.03 g, 0.10 mmol) in 5% AcOH in MeOH (1 mL) was added 1-methyl-5-imidazolecarboxaldehyde (0.01 g, 0.14 mmol). The reaction mixture was stirred at r.t. for 20 minutes. Sodium cyanoborohydride (0.02 g, 0.39 mmol) was then added, and the reaction mixture stirred for a further 10 minutes before being concentrated in vacuo. Purification by preparative HPLC (Method 6) gave the title compound (0.01 g, 32%) as a yellow oil. δH (CDCl3) 8.28 (1H, s), 8.17 (1H, s), 7.22 (1H, s), 7.17 (1H, d, J 2.6 Hz), 6.82 (1H, d, J 8.7 Hz), 6.47 (1H, dd, J 8.9 and 2.8 Hz), 5.82 (1H, s), 4.34 (2H, s), 4.29-4.22 (2H, m), 4.19-4.11 (2H, m), 3.86 (3H, s), 2.86 (2H, s), 1.39 (6H, s). LCMS (ES+) 425.42 (M+H)+, RT 1.85 minutes (Method 1).

1. stirringthe reaction mixture stirred for a further 10 minutes
2. concentrationbefore being concentrated in vacuo
3. customPurification by preparative HPLC (Method 6)