反应详情

温度

5 °C

A solution of 1-(4-phenyl-1H-imidazol-2-yl)-ethylamine (0.061 g, 0.33 mmol) of Example 3, and 0.55 g (0.33 mmol) of 3,4-dimethoxybenzaldehyde in 5 mL of anhydrous methanol was stirred at room temperature for 1 h and then cooled to about 0-10° C. in an ice bath for 1 h. The reaction was treated carefully with 0.019 g (0.49 mmol) of sodium borohydride in one portion and maintained at about 0-10° C. for 21 h. Cold 2M aqueous HCl was added dropwise (30 drops), the mixture was stirred for 5 min, and then partially concentrated in vacuo unheated. The residual material was taken up in EtOAc to yield a suspension that was treated with 5 mL of cold 3M aqueous NaOH and stirred vigorously until clear. The phases were separated and the aqueous layer was extracted three times additional with EtOAc. The combined extracts were dried over MgSO4, filtered, and concentrated to yield (3,4-dimethoxy-benzyl)-[1-(4-phenyl-1H-imidazol-2-yl)-ethyl]-amine as a light yellow oil (HPLC: 87% @ 254 nm and 66% @ 214 nm).

1. temperaturemaintained at about 0-10° C. for 21 h
2. concentrationpartially concentrated in vacuo unheated
3. customto yield a suspension that
4. stirringstirred vigorously until clear
5. customThe phases were separated
6. extractionthe aqueous layer was extracted three times additional with EtOAc
7. dry with materialThe combined extracts were dried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated