反应详情

To a solution of N-[1-Eth-(Z)-ylidene-5,5-dimethoxy-2-oxo-pentyl] acrylimidoyl bromide(7.0 g, 28.9 mmol) in a solution of acetone(30 mL) and water(1.5 mL) at room temperature, is added Amberlyse-15(20 g). After mechanical shacking for 3 hr at room temperature, the reaction mixture is filtered. The resin beads were washed with acetone (contain 10% of Et3N). The combined organic layers were concentrated and purified by chromatography(Hexane/EtOAc: 70/30) to yield N-[1-Eth-(Z)-ylidene-2,5-dioxo-pentyl]-acrylimidoyl bromide(5.18 g, 88.1%) as light yellow liquid. M/Z=421, 243.9 [M+1]

1. filtrationthe reaction mixture is filtered
2. washThe resin beads were washed with acetone (contain 10% of Et3N)
3. concentrationThe combined organic layers were concentrated
4. custompurified by chromatography(Hexane/EtOAc: 70/30)