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2005
Enantioselective syntheses
O 0031
Diastereoselective Synthesis of Thieno[3',2':4,5]cyclopenta[1,2-d][1,3]oxazolines
New Ligands for the Copper-Catalyzed Asymmetric Conjugate Addition of Di07- 026 —
ethylzinc to Enones. — Catalysts prepared in situ from ligands (I) or (V) and Cu(OTf)2
are studied in the reaction of diethylzinc with chalcone in either toluene or Et2O. All
ligands studied give good enantioselectivities. The e.e. values of ligand (Ia) are superior
to those obtained for the same reaction with known S,N ligands and very close to the
best values available for P,N ligands. — (BONINI, B. F.; CAPITO, E.;
COMES-FRANCHINI, M.; RICCI*, A.; BOTTONI, A.; BERNARDI, F.; MISCIONE,
G. P.; GIORDANO, L.; COWLEY, A. R.; Eur. J. Org. Chem. 2004, 21, 4442-4451;
Dip. Chim. Org. "A. Mangini", Univ. Bologna, I-40136 Bologna, Italy; Eng.) —
Klein
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