Ethyl diazoacetate → HCID 91324394, compound

Participants

Reaction Steps

Around-bottomed flask was charged with 3-fluorostyrene (13.0 g, 0.107 mol) in anhydrous methylene chloride (130 mL). To this mixture was added rhodium acetate dimer (1.30 g, cat amount). A solution of ethyldiazoacetate (33.28 g, 0.291 mol) in anhydrous methylene chloride (130 mL) was added to the reaction via a syringe pump over 5 h and stirred at room temperature for 1 h in darkness. The reaction mixture was filtered through a plug of celite, which was washed with water followed by brine. The organic layer was dried over Na2SO4 and evaporated to dryness. Flash chromatography (silica, EtOAc/petroleum ether 1:9) gave rac-trans 2-(3-fluoro-phenyl)-cyclopropanecarboxylic acid ethyl ester (13.0 g, 59%) as a colorless liquid sufficiently pure for the next step.

Provenance & Evidence