反应详情

Alternately, combine 2-chloro-1-(2-ethoxyethyl)-1H-benzimidazole (15.56 g, 69.3 mmol) and [1,4]diazepane (13.89 g, 138.7 mmol), 1,8-diazabicyclo(5.4.0]undec-7-ene (12.34 mL, 83.1 mmol), and pyridine (200 mL). Heat to reflux. After 18 hours, cool to ambient temperature and evaporate in vacuo to give a residue. Partition the residue between aqueous 1 M sodium hydroxide solution and dichloromethane. Separate the layers and extract the aqueous layer two times with dichloromethane. Combine the organic layers, extract with aqueous 1 M sodium hydroxide solution, water, and then brine. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 2% concentrated aqueous ammonia/methanol to give the title compound: Rf=0.26 (silica gel, 2% concentrated aqueous ammonia/methanol).

1. temperatureHeat to reflux
2. customevaporate in vacuo
3. customto give a residue
4. customPartition the residue between aqueous 1 M sodium hydroxide solution and dichloromethane
5. customSeparate the layers
6. extractionextract the aqueous layer two times with dichloromethane
7. extractionextract with aqueous 1 M sodium hydroxide solution, water
8. dry with materialDry the organic layer over Na2SO4
9. filtrationfilter
10. customevaporate in vacuo
11. customto give a residue