反应详情

A mixture of 1-allyl-2,4-dichloro-7-(1-ethylpropyl)-1H-benzimidazole (1.19 g, 4.00 mmol), N2,N2,4-trimethylpyridine-2,5-diamine (1.21 g, 8.00 mmol) and p-toluenesulfonic acid monohydrate (760 mg, 4.00 mmol) in 1-methyl-2-pyrrolidinone (12 mL) was irradiated by microwave at 180° C. for 1 hr. After cooling, the mixture was diluted with ethyl acetate, washed with aqueous sodium bicarbonate, water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 30-80% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was recrystallized from ethyl acetate/n-hexane to give the title compound (430 mg, 1.04 mmol, 26%) as a colorless solid.

1. customwas irradiated by microwave at 180° C. for 1 hr
2. temperatureAfter cooling
3. washwashed with aqueous sodium bicarbonate, water and brine
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash chromatography on silica gel eluting with a 30-80% ethyl acetate/n-hexane gradient mixture
7. concentrationThe filtrate was concentrated in vacuo
8. customto give the solid, which
9. customwas recrystallized from ethyl acetate/n-hexane