Ethyl diazoacetate → HCID 22141267, compound

Participants

Reaction Steps

To a solution of 1-[(E)-3-chloro-1-ethyl-1-propenyl]-3-nitrobenzene (Preparation 15, 50 g, 0.22 mol) in dichloromethane (40 ml) was added rhodium (II) acetate dimer (2.0 g, 4.6 mmol). To the mixture was added dropwise at room temperature over 6 hours a solution of ethyl diazoacetate (50 ml, 54.25 g, 0.475 mol) in dichloromethane (50 ml), then the mixture stirred at room temperature for 16 hours. To the mixture was added dropwise at room temperature over 7 hours a solution of ethyl diazoacetate (20 ml, 21.70 g, 0.190 mol) in dichloromethane (20 ml), then the mixture was stirred at room temperature for 16 h. The mixture was concentrated in vacuo and the residue purified by silica column (1 kg) chromatography, eluting with 1:1 hexane/dichloromethane. Product-containing fractions were combined and concentrated in vacuo to give the title compound as a pale orange oil (10.5 g, 15%).

Provenance & Evidence