反应详情

5-Amino-4-imidazolecarboxamide hydrochloride (0.162 g, 1.0 mmol) and 2-methoxy-2-methylpropanal, which was obtained from Example 3(a) (0.204 g, 2.0 mmol) were mixed in methanol (3 mL) at r.t. Acetic acid (141 μL, 2.46 mmol) mL) was then added and the mixture was allowed to stir for 30 min followed by addition of NaCNBH3 (0.063 g, 1.0 mmol). After 3 h, additional 2-methoxy-2-methylpropanal (0.060 g, 0.59 mmol) was added. The reaction mixture was stirred at r.t. for 17 h and was then concentrated and purified by flash silica gel chromatography (CHCl3:MeOH=5:1). The title compound was obtained as an oil in 73% yield (0.155 g). MS (ESI) m/z 213 (M+1).

1. waitAfter 3 h
2. stirringThe reaction mixture was stirred at r.t. for 17 h
3. concentrationwas then concentrated
4. custompurified by flash silica gel chromatography (CHCl3:MeOH=5:1)