VICINAL ALKYLATION OF ALKYNES. A SHORT ROUTE TOWARD Δα,β BUTENOLIDES, FURANS AND CYCLOPENTENONES.

Article abstract of DOI:10.1016/S0040-4039(01)91114-1

Cyclobutenones 1 which are readily prepared from alkynes and keteniminium salts 2 were regiospecifically converted into Δ^α,β butenolides 4 or cyclopentenones 7.Reaction of 4 with diisobutylaluminium hydride yielded the corresponding substituted