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Zirconium mediated cocyclisation of alpha,omega-dienes to give zircona
bicycles, followed by allylcarbenoid insertion, electrophile addition,
and iodine quench gave highly functionalised organic structures. Furt
her elaboration including an intramolecular Diels-Alder reaction gave
a variety of fused tricyclic compounds including the 5,7,6 skeleton of
the dolastane diterpenes and the 6,7,6 (aromatic) rearranged 9(10-->1
20)-abeo-abietane skeleton of pisiferanol. (C) 1997 Elsevier Science L
td. All rights reserved.