反应详情

492 mg of a 28% w/v solution of sodium methoxide in methanol were added to a solution of 655 mg of diethyl 1-benzyl-2-bromomethylimidazole-4,5-dicarboxylate [prepared as described in step (ii) above] in 7 ml of methanol, and the mixture was allowed to stand at room temperature for 13 hours. At the end of this time, 2.5 ml of 1N aqueous hydrochloric acid were added to the reaction solution, and the methanol was removed by distillation under reduced pressure. The concentrate was mixed with ethyl acetate and water and then shaken. The ethyl acetate layer was separated, washed with a saturated aqueous solution of sodium hydrogencarbonate and with a saturated aqueous solution of sodium chloride, in that order, and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure, and then the residue was purified by column chromatography through silica gel, using a 5:1 by volume mixture of methylene chloride and ethyl acetate as the eluent, to give 391 mg of the title compound as a syrup.

1. customthe methanol was removed by distillation under reduced pressure
2. additionThe concentrate was mixed with ethyl acetate and water
3. customThe ethyl acetate layer was separated
4. washwashed with a saturated aqueous solution of sodium hydrogencarbonate and with a saturated aqueous solution of sodium chloride, in that order
5. dry with materialdried over anhydrous magnesium sulfate
6. customThe solvent was removed by distillation under reduced pressure
7. customthe residue was purified by column chromatography through silica gel
8. additionby volume mixture of methylene chloride and ethyl acetate as the eluent