反应详情

To a solution of 7.2 g (0.306 mole) of 1-benzyl-2-methylimidazol-4-carboxaldehyde in 100 ml of tetrahydrofuran was added 15 ml of 2.9M methyl magnesium chloride (0.044 mole) in tetrahydrofuran. A white precipitate formed immediately. The mixture was stirred at room temperature for 30 minutes and then heated with 50 ml of 25% aqueous ammonium chloride solution. The precipitate was filtered off, washed with tetrahydrofuran and air dried. The combined filtrate and wash solutions were dried (Na2SO4) and concentrated in vacuo to a solid residue. The residue was dissolved in 300 ml of boiling ethyl acetate, dried (Na2SO4) and concentrated to half volume under reduced pressure. The solid which separated upon cooling was filtered off and air dried. Total yield=7.1 g (90%); m.p. 162.5°-167.5° C.

1. customA white precipitate formed immediately
2. filtrationThe precipitate was filtered off
3. washwashed with tetrahydrofuran and air
4. customdried
5. washThe combined filtrate and wash solutions
6. dry with materialwere dried (Na2SO4)
7. concentrationconcentrated in vacuo to a solid residue
8. dissolutionThe residue was dissolved in 300 ml of boiling ethyl acetate
9. dry with materialdried (Na2SO4)
10. concentrationconcentrated to half volume under reduced pressure
11. customThe solid which separated
12. temperatureupon cooling
13. filtrationwas filtered off
14. customair dried