E. Marotta et al., A NEW, EFFECTIVE ROUTE TO METHYL-SUBSTITUTED 3,3A,4,6A-TETRAHYDRO-2H-CYCLOPENTA[B]FURAN-2-ONES, Tetrahedron letters, 35(18), 1994, pp. 2949-2950
3,3a,4,6a-Tetrahydro-2H-cyclopenta[b]furan-2-ones 1, important startin
g materials in the synthesis of linear condensed triquinane sesquiterp
enes, have been prepared in an efficient manner by an effective bicycl
ization of 3-hydroxy-6-heptenoic acids, followed by a Baeyer-Villiger
oxidation of the bicyclo[3.2.0]hept-3-en-6-one intermediates.