| Autor: |
Harada T; Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. harada@chem.kit.ac.jp, Hiraoka Y, Kusukawa T, Marutani Y, Matsui S, Nakatsugawa M, Kanda K |
| Jazyk: |
angličtina |
| Zdroj: |
Organic letters [Org Lett] 2003 Dec 25; Vol. 5 (26), pp. 5059-62. |
| DOI: |
10.1021/ol0360546 |
| Abstrakt: |
Bis-BINOLs 7a-c in which two BINOL units are tethered by phenylenebis(ethynyl) groups react with titanium tetraisopropoxide (2 equiv) to form intramolecular dimeric titanium(IV) aggregates 2a-c. Of these, 2a,b with an o-phenylenebis(ethynyl) tether are stable in the presence of excess titanium tetraisopropoxide. Complex 2a exhibits a relatively high enantioselectivity in asymmetric addition of diethylzinc to an aldehyde. [structure: see text] |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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