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2005
Cyclopentane derivatives
Q 0030
Ligand Effects in Gold- and Platinum-Catalyzed Cyclization of Enynes: Chiral
Complexes for Enantioselective Alkoxycyclization. — The Pt(II)-catalyzed
29- 079 Gold
cyclization reactions of enynes in the presence of alcohols are efficiently performed
under reflux using bidentate phosphine or N—N ligands. In the latter case the presence
of AgOTf is necessary to obtain good yields. The best ligand to achieve high levels of
enantioselection in the Pt-catalyzed reaction is found to be tolBINAP. Among the Au(I)
complexes studied, chiral tolBINAP-derived gold complex BPA gives the best results
in the presence of a Ag(I) salt. Although, in general, the asymmetric inductions obtained by this catalyst are not high, the reactions proceed at room temperature in all
cases, except one. — (MUNOZ, M. P.; ADRIO, J.; CARRETERO, J. C.;
ECHAVARREN*, A. M.; Organometallics 24 (2005) 6, 1293-1300; Dep. Quim. Org.,
Univ. Auton., Cantoblanco, E-28049 Madrid, Spain; Eng.) — Klein
2005
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