Abstract

The (3+2) cycloaddition of diphenyldiazomethane (2) (1,3-dipole) with 3-methylenedihydro-(3H)furan-2-one (5) as dipolarophile leads to the spiranic cyclopropyl derivative 1,1-diphenyl-4-oxo-5-oxaspiro(2.4)heptane (8b).

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