反应详情

To a suspension of tetrakis(triphenylacetate)dirhodium (3.66 g) and powdered molecule sieves (45 g) in dichloromethane (2.0 L) was added 1-chloro-1-fluoroethene (82 g, 1.02 mol) at −60° C. The reaction mixture was warmed to −35˜−40° C., ethyl 2-diazoacetate (90 g, 790 mmol) in DCM (200 mL) was added and the reaction mixture was stirred at room temperature overnight. The reaction mixture was filtered and evaporated in vacuo to yield 100 g Ethyl 2-chloro-2-fluorocyclopropanecarboxylate as yellow oil which was used directly in the next step without purification.

1. temperatureThe reaction mixture was warmed to −35˜−40° C.
2. filtrationThe reaction mixture was filtered
3. customevaporated in vacuo