An effort to synthesize hetero-cyclic five-member ring using 3]2] cycloaddition reaction of epoxide with olefin is reported. Hetero-cyclic five-member ring has wide range of applications in pharmaceutics because most of them are biologically active compounds. Here 2,2-dicyano-3,4-diethoxycarbony-l-4-fluoro-5-phenylfuran has been made by the reaction of gem-dicyano phenyl epoxide with diethyl (E)-2-fluoromaleate.
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