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2005
Enantioselective syntheses
O 0031
Novel Lewis Acid Assisted Chiral Lewis Acid (LLA) System: Development
Boroxin—Ti—BINOL-Catalyzed Asymmetric Allylation of Aldehydes. —
18- 029 of
The addition of a low amount (1—5 mol%) of a second Lewis acid towards a
Ti((S)-BINOL) catalyst can enhance its catalytic efficiency in the allylation of aldehydes (II) and (V). Best results are achieved with trifluoromethylphenylboroxin. Use
of higher amounts of the second Lewis acid lead to competitive catalysis of the non-stereoselective allylation and to reduced optical purity of the products. — (XIA, G.;
SHIBATOMI, K.; YAMAMOTO*, H.; Synlett 2004, 13, 2437-2439; Dep. Chem.,
Univ. Chicago, Chicago, IL 60637, USA; Eng.) — Mischke
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