Tetranuclear titanium 7,7′-modified binaphtholate cluster as a novel chiral Lewis acid catalyst

Chiral tetranuclear Ti cluster, a cubic structure constituted of four Ti atoms and OHs, and six (R)‐binaphthols (BINOL) bridged two Ti atoms as ligands, is shown to be a novel chiral Lewis acid catalyst for the [2+3] cycloaddition reaction with nitrones. The chiral Ti clusters with 7,7′‐substituted...

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Published inChirality (New York, N.Y.) Vol. 13; no. 9; pp. 541 - 544
Main Authors Mikami, Koichi, Ueki, Makoto, Matsumoto, Yousuke, Terada, Masahiro
Format Journal Article
LanguageEnglish
Published New York John Wiley & Sons, Inc 2001
Subjects
7,7′‐substituted binaphthols
7′-substituted binaphthols
asymmetric [2+3] cycloaddition reaction
asymmetric catalyst
chiral Lewis acid
chiral titanium complex
cluster
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Summary:Chiral tetranuclear Ti cluster, a cubic structure constituted of four Ti atoms and OHs, and six (R)‐binaphthols (BINOL) bridged two Ti atoms as ligands, is shown to be a novel chiral Lewis acid catalyst for the [2+3] cycloaddition reaction with nitrones. The chiral Ti clusters with 7,7′‐substituted (R)‐BINOL ligands was synthesized to give enhanced enantiomeric excesses up to 78% ee. Chirality 13:541–544, 2001. © 2001 Wiley‐Liss, Inc.
Bibliography:istex:A74C5B2DD8E49338E0989651ABA34D7EAB5B68D2
ArticleID:CHIR1174
ark:/67375/WNG-VCR0T7K2-3
In honor of the 60th birthday of Professor Takeshi Nakai.
ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0899-0042
1520-636X
DOI:10.1002/chir.1174