反应详情

To a solution of [(E)-3-bromo-1-propenyl]benzene (705 mg, 3.58 mmol) in dichloromethane (1 ml) was added rhodium (II) acetate dimer (20 mg, 0.05 mmol). To the mixture was added dropwise at room temperature over 4 h a solution of ethyl diazoacetate (0.43 ml, 0.47 g, 4.15 mmol) in dichloromethane (2.5 ml). The mixture was stirred at room temperature for 60 h. The mixture was purified by silica column (40 g) chromatography eluting with 1:1 hexane:dichloromethane then dichloromethane. Product-containing fractions were purified further by silica column (10 g) chromatography eluting with 9:1 hexane:dichloromethane then dichloromethane. Product-containing fractions were combined and concentrated in vacuo to give the title compound as a colourless oil (75 mg, 8%).

1. customThe mixture was purified by silica column (40 g) chromatography
2. washeluting with 1:1 hexane
3. customProduct-containing fractions were purified further by silica column (10 g) chromatography
4. washeluting with 9:1 hexane
5. concentrationconcentrated in vacuo