反应详情

To 4,6-dimethyl-5-methoxy-2-mercapto-1H-benzimidazole (1.04 g, 0.0050 mol) in methanol (50 ml) were added (in the following order) NaOH (0.2 g, 0.0050 mol) dissolved in water (2 ml) and 3,4-dimethyl-2-chloromethylpyridine hydrochloride (0.96 g, 0.0050 mol). The mixture was heated until reflux. NaOH (0.2 g, 0.0050 mol) dissolved in water (2 ml) was added dropwise and then the reflux was continued for 3 hours. The mixture was poured on ice-water (200 ml). Filtration and recrystallization from CH3CN gave the desired product (1.1 g, 67%). NMR data for the final product is given below.

1. temperatureThe mixture was heated
2. temperatureuntil reflux
3. additionwas added dropwise
4. additionThe mixture was poured on ice-water (200 ml)
5. filtrationFiltration and recrystallization from CH3CN