Patent ID: 8809557

Claim:
A method for producing an optically active fluorinated oxetane of the general formula [3], comprising: reacting a fluorinated α-keto ester of the general formula [1] with an acyl alkenyl ether of the general formula [2] in the presence of a transition metal complex with an optically active ligand, wherein the transition metal complex with the optically active ligand is present in an amount less than a stoichiometric amount, where Rf represents a perfluoroalkyl group; and R 1 represents an alkyl group; where R 2 , R 3 , R 4 and R 5 each independently represent a hydrogen atom, an alkyl group, a substituted alkyl group, an aromatic ring group or a substituted aromatic ring group; and where Rf, R 1 , R 2 , R 3 , R 4 and R 5 are the same as above: * represents an asymmetric carbon atom (when R 4 and R 5 are the same substituents, a carbon atom to which R 4 and R 5 are bonded is not an asymmetric carbon atom); and the wavy lines indicate that the configuration of acyloxy (R 2 CO 2 ) group relative to Rf and the configuration of R 4 relative to Rf are each independently a syn configuration, an anti configuration or a mixture thereof.