Efficient and Practical Ag-Catalyzed Cycloadditions between Arylimines and the Danishefsky Diene
摘要:
An efficient Ag-catalyzed method for asymmetric addition of the Danishefsky diene to various aryl imines to afford cycloadducts in > or =89% ee and > or =85% isolated yield is reported. Reactions are effected with 0.1-1 mol % catalyst (4 degrees C), and the chiral ligand is readily prepared from commercially available materials, including the inexpensive i-Leu. These catalytic asymmetric cycloadditions can be carried out without the use of solvent or with undistilled THF in air. A first generation supported chiral catalyst that effectively promotes the cycloaddition reaction and can be recycled (five cycles) is described.
A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer to form a reactive polymer, and (ii) reacting the reactive polymer with an imine compound containing a heterocyclic group and a hydrocarbyloxy-substituted or silyloxy-substituted aryl group.
US9850328B2
申请人:——
公开号:US9850328B2
公开(公告)日:2017-12-26
[EN] POLYMERS FUNCTIONALIZED WITH HETEROCYCLIC IMINES<br/>[FR] POLYMÈRES FONCTIONNALISÉS PAR DES IMINES HÉTÉROCYCLIQUES
申请人:BRIDGESTONE CORP
公开号:WO2014149931A1
公开(公告)日:2014-09-25
A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer to form a reactive polymer, and (ii) reacting the reactive polymer with an imine compound containing a heterocyclic group and a hydrocarbyloxy-substituted or silyloxy-substituted aryl group.
Efficient and Practical Ag-Catalyzed Cycloadditions between Arylimines and the Danishefsky Diene
作者:Nathan S. Josephsohn、Marc L. Snapper、Amir H. Hoveyda
DOI:10.1021/ja030033p
日期:2003.4.1
An efficient Ag-catalyzed method for asymmetric addition of the Danishefsky diene to various aryl imines to afford cycloadducts in > or =89% ee and > or =85% isolated yield is reported. Reactions are effected with 0.1-1 mol % catalyst (4 degrees C), and the chiral ligand is readily prepared from commercially available materials, including the inexpensive i-Leu. These catalytic asymmetric cycloadditions can be carried out without the use of solvent or with undistilled THF in air. A first generation supported chiral catalyst that effectively promotes the cycloaddition reaction and can be recycled (five cycles) is described.