反应详情

2-Ethyl-4-methyl-1H-imidazole (3.3 g, 30 mM) and sodium hydride (50% by weight in mineral oil, 80 mM) in dimethylformamide (20 ml) was heated at 50° C. for 1/2 hour. The solution of 4-(3-bromopropyl)-1-piperidinecarboxaldehyde (7 g, 30 mM) in dimethylformamide (20 ml) was added at 50° C. and stirred at that temperature for 4 hours. After the reaction, solvent was removed in vacuo and water (100 ml) was added and then extracted with ethyl acetate (2×100 ml). The extracts, dried over Na2SO4, was stripped to dryness and purified on silica gel column, eluted with 2% by volume MeOH, 98% by volume CH2Cl2, to give 4-[3-(2-ethyl-4-methyl-1H-imidazol-1-yl)propyl]-1-piperidinecarboxaldehyde as an oil (4.04 g, 51% yield).

1. customAfter the reaction, solvent
2. customwas removed in vacuo and water (100 ml)
3. additionwas added
4. extractionextracted with ethyl acetate (2×100 ml)
5. dry with materialThe extracts, dried over Na2SO4
6. custompurified on silica gel column
7. washeluted with 2% by volume MeOH, 98% by volume CH2Cl2