Water-promoted reactions: Generation of oxyallyl intermediates and their [4+3] cycloadditions with furan and cyclopentadiene. Facile access to bridged-cycloheptenones

Article abstract of DOI:10.1016/S0040-4039(97)10156-3

α,α-dibromo ketones in the presence of iron powder, or α-chloro ketones in the presence of triethylamine, have been shown to react very easily with furan or cyclopentadiene when water was used as solvent.