反应详情

To 3.9 g of 2-methyl-5H-1,3-dioxolo-(4,5-f)benzimidazole-6-thiol, suspended in 60 ml of alcohol, were added dropwise while stirring 1.57 g of sodium hydroxide in 30 ml of water and, after 30 minutes, there were added 3.44 g of 5-methyl-2-chloromethylpyridine hydrochloride. The mixture was left to boil at reflux overnight, then evaporated and the residue was taken up in 500 ml of ethyl acetate. This was washed with 100 ml of sodium hydroxide, three times with 100 ml of water, dried over sodium sulfate and evaporated in vacuo. The crude product was recrystallized from ethyl acetate/petroleum ether (low boiling) and there were obtained 4.8 g (81.7% of theory) of 2-methyl-6-[[(5-methyl-2-pyridyl)methyl]-thio]-5H-1,3-dioxolo(4,5-f)benzimidazole of melting point 147°-148° C.

1. additionwere added dropwise
2. waitThe mixture was left
3. temperatureat reflux overnight
4. customevaporated
5. washThis was washed with 100 ml of sodium hydroxide, three times with 100 ml of water
6. dry with materialdried over sodium sulfate
7. customevaporated in vacuo
8. customThe crude product was recrystallized from ethyl acetate/petroleum ether (low boiling)