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[13] For the use of chiral ligands attached to metals other than cobalt, see: (a) F. A. Hicks
and S. L. Buchwald, Highly enantioselective catalytic Pauson-Khand type formation
of bicyclic cyclopentenones, J. Am. Chem. Soc. 118 , 11688 (1996); (b) S. J. Sturla
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intramolecular titanium-catalyzed asymmetric Pauson-Khand type reaction, J. Am.
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[14] A. Moyano, F. Charbonnier, and A. E. Greene, A simple preparation of chiral
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[15] For another approach to alkoxyacetylenes, see: M. A. Pericas, F. Serratosa, and E.
Valentı, An efficient synthesis of tert -alkoxyethynes, Tetrahedron 43 , 2311 (1987).
[16] M. Poch, E. Valentı, A. Moyano, M. A. Pericas, J. Castro, A. DeNicola, and A. E.
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by a cobalt mediated intramolecular cyclization, Tetrahedron Lett. 26 , 2475 (1985);
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Mikaelian, R. Caple, and E. D. Swanson, New route to the synthesis of polycyclic
compounds based on a stepwise Ad E -reaction of dicobalt hexacarbonyl complexes of
conjugated enynes with a subsequent intramolecular Khand-Pauson reaction, Tetrahe-
dron Lett. 27 , 1241 (1986); (d) E. Carceller, M. L. Garcıa, A. Moyano, M. A. Pericas,
and F. Serratosa, Synthesis of triquinacene derivatives. A new approach towards the
synthesis of dodecahedrane, Tetrahedron 42 , 1831 (1986); (e) S. L. Schreiber, T.
Sammakia, and W. E. Crowe, Lewis acid mediated version of the Nicholas reaction:
synthesis of syn -alkylated products and cobalt-complexed cycloalkynes, J. Am. Chem.
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larly fused triquinanes via intramolecular Pauson-Khand reaction, J. Org. Chem. 52 ,
569 (1987); (g) C. Almansa, A. Moyano, and F. Serratosa, Synthesis and chiroptical
properties of C 3 -perhydrotriquinacene derivatives, Tetrahedron 44 , 2657 (1988); (h)
N. E. Schore and E. G. Rowley, Diastereofacial selectivity in intramolecular Pauson-
Khand cycloadditions: highly stereoselective synthesis of pentalenene, J. Am. Chem.
Soc. 110 , 5224 (1988).
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