M. Hatanaka et al., SYNTHESIS OF (+ -)-PENTALENENE VIA REGIOSELECTIVE INTRAMOLECULAR DIELS-ALDER REACTION OF TRISUBSTITUTED CYCLOPENTADIENE/, Tetrahedron letters, 37(1), 1996, pp. 89-90
A stereoselective synthesis of (+/-)-pentalenene has been described vi
a an intramolecular Diels-Alder reaction of trisubstituted cyclopentad
iene and subsequent elaboration of the C-ring including stereoselectiv
e induction of the 9-methyl group.