反应详情

4-Amino-1H-imidazole-5-carboxamide (13.0 g, 0.104 mol) and valeraldehyde (11 mL, 0.10 mol) were mixed in methanol (200 mL). After being stirred for 30 min, sodium cyanoborohydride (6.5 g, 0.10 mol) was added to the solution and stirring was continued overnight. The reaction mixture was concentrated under reduced pressure. The remaining residue was taken up in EtOAc and the resulting solution was washed with saturated NaHCO3. The aqueous layer was extracted with EtOAc three times. The combined organic layers were dried (MgSO4) and concentrated. The residue was purified by flash chromatography (DCM to 5% MeOH/DCM) to give the desired product (12.9 g, 63.1%). LCMS calculated for C9H16N4O (M+H): 197.1. found: 180.1 (M+H—NH3).

1. stirringstirring
2. waitwas continued overnight
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. washthe resulting solution was washed with saturated NaHCO3
5. extractionThe aqueous layer was extracted with EtOAc three times
6. dry with materialThe combined organic layers were dried (MgSO4)
7. concentrationconcentrated
8. customThe residue was purified by flash chromatography (DCM to 5% MeOH/DCM)