反应详情

To a solution of ethyl 4-(2-methylimidazol-1-yl)benzoate (46 g, 0.2 mol) in dry CH2Cl2 (1 l) cooled to -75° C. under a nitrogen atmosphere was added diisobutyl-aluminum hydride (540 ml, 0.93 M in hexane) carefully over 30 minutes and then the mixture was allowed to warm slowly to ambient temperature. After stirring for 5 hours the reaction mixture was cooled in an ice-bath and methanol (30 ml) carefully added. A 30% aqueous solution of Rochelle's salt (500 ml) was then added and the mixture stirred at ambient temperature for 16 hours. Insolubles (essentially product) were removed by filtration and the organic phase separated and washed with water (500 ml), dried (MgSO4) and evaporated. The combined resultant solids were recrystallized from ethanol (ca 300 ml) to afford the titled compound (35.6 g, 95%) as white needles.

1. temperaturewas cooled in an ice-bath
2. stirringthe mixture stirred at ambient temperature for 16 hours
3. customInsolubles (essentially product) were removed by filtration
4. customthe organic phase separated
5. washwashed with water (500 ml)
6. dry with materialdried (MgSO4)
7. customevaporated
8. customwere recrystallized from ethanol (ca 300 ml)