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The intramolecular Pauson-Khand (PK) reaction of 4-bromomethyldimethylsilyloxy-4-ethynyl-6,6-dimethyloct-1-en-7-yne (1), the differently functionalized 4-ethynyl-octa-1,7-dienes (2-6), and 5-ethynyl-5-hydroxy-2,4,4-trimethyl-nona-1,8-diene (7) is reported. The resulting bicyclo[3.3.0]oct-1-en-3-ones (22-29) and (33-35) have been obtained in good yield, with moderate stereoselectivity. Major isomers...
The preparation of δ-substituted -acetylenic β-ketoesters is fully described. Their cobalt-mediated Conia-ene reactions led to variously functionalized methylenecyclopentanes in high yields and with a moderate control of the 1,4 diastereoselectivity. A sequence involving the cobalt-mediated ene and Pauson-Khand reactions is presented and allowed the construction of the angular triquinane framework.
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