反应详情

温度

5 °C

To a stirred solution of chloropyrazine (1.14 g) and [1,2-bis(diphenylphosphino)ethane]nickel(II) chloride (106 mg) in dry tetrahydrofuran (40 ml) was added a solution of 3,4-methylenedioxybenzylmagnesium chloride (0.6 M in tetrahydrofuran, 29 ml) at 5° C. under nitrogen atmosphere over 15 minutes. After 1 hour of stirring at 5° C., 3N hydrochloric acid was added slowly under nitrogen atmosphere and the mixture was stirred for 1 hour. The organic layer was separated and the aqueous layer was extracted with ethyl acetate. The combined extract was washed with water and dried over magnesium sulfate. The usual work up followed by flash chromatography on silica gel with a mixture of n-hexane and ethyl acetate (10:1-4:1) gave 2-(3,4-methylenedioxybenzyl)pyrazine (454 mg) as a colorless oil.

1. stirringthe mixture was stirred for 1 hour
2. customThe organic layer was separated
3. extractionthe aqueous layer was extracted with ethyl acetate
4. extractionThe combined extract
5. washwas washed with water
6. dry with materialdried over magnesium sulfate
7. additionThe usual work up followed by flash chromatography on silica gel with a mixture of n-hexane and ethyl acetate (10:1-4:1)