Preparation and catalytic applications of partially fluorinated binaphthol ligands
作者:Shahla Yekta、Larissa B Krasnova、Brian Mariampillai、Christine J Picard、Gang Chen、Subramanian Pandiaraju、Andrei K Yudin
DOI:10.1016/j.jfluchem.2003.11.024
日期:2004.4
New partially fluorinated binaphthols were obtained using a copper-catalyzed oxidativecoupling. The corresponding enantiomerically pure compounds were prepared by fractional crystallization of the corresponding bis(menthyl)carbamates. Nucleophilic aromatic substitution using oxygen- and carbon-based nucleophiles resulted in functionalized derivatives without concomitant racemization. The titanium(IV)
Regioselective Substitution of Fluorine in F<sub>8</sub>BINOL as a Versatile Route to New Ligands with Axial Chirality
作者:Yu Chen、Shahla Yekta、L. James P. Martyn、Juan Zheng、Andrei K. Yudin
DOI:10.1021/ol006428k
日期:2000.11.1
aromatic fluorine in F(8)BINOL offers the possibility of selectively introducing a variety of substituents at the 6, 6', 7, and 7' positions. The configurational integrity of the homochiral precursors is maintained under the conditions described, allowing one to carry out these modification protocols on a microscale without the need for subsequent resolution steps. The resulting chiral ligands have been investigated
The present application provides, among other things, novel compounds and methods for metathesis reactions. In some embodiments, a provided compound has the structure of formula I. In some embodiments, the present invention provides methods for preparing a compound of formula I. In some embodiments, the present invention provides metathesis methods comprising providing a compound of formula I.
The present invention relates generally to olefin metathesis. In some embodiments, the present invention provides methods for Z-selective ring-closing metathesis.