Brønsted Acid-Catalyzed, Highly Enantioselective Addition of Enamides to In Situ<i>-</i>Generated<i>ortho</i>-Quinone Methides: A Domino Approach to Complex Acetamidotetrahydroxanthenes
作者:Satyajit Saha、Christoph Schneider
DOI:10.1002/chem.201406044
日期:2015.2.2
The highly enantioselective conjugate addition of enamides and enecarbamates to in situ‐generated ortho‐quinone methides, upon subsequent N,O‐acetalization, gives rise to acetamido‐substituted tetrahydroxanthenes with generally excellent enantio‐ and diastereoselectivities. A chiral BINOL‐based phosphoric acid catalyst controls the enantioselectivity of the carbon–carbon bond‐forming event. The products
ORGANIC SALTS AND METHOD FOR PRODUCING CHIRAL ORGANIC COMPOUNDS
申请人:List Benjamin
公开号:US20090030216A1
公开(公告)日:2009-01-29
The invention relates to a method for producing chiral organic compounds by asymmetric catalysis, using ionic catalysts comprising a chiral catalyst anion. The claimed method is suitable for reactions which are carried out over cationic intermediate stages, such as iminium ions or acyl pyridinium ions. The invention enables the production of chiral compounds with high ee values, that until now could only be obtained by means of costly purification methods.
A Protecting-Group-Free Route to Chiral BINOL-Phosphoric Acids
作者:Baojian Li、Pauline Chiu
DOI:10.1002/ejoc.201100328
日期:2011.7
A two-step, protecting group-free route for the synthesis of 3,3′-disubstituted and 6,6′-disubstituted chiralBINOL–phosphoricacids has been realized starting from commercially available brominated BINOLs. This synthesis relies on the direct Suzuki coupling of brominated BINOL phosphoric acids. This synthetic strategy is more efficient compared to previous circuitous strategies involving protections
[EN] POLYVINYL ETHERS AND METHODS RELATED THERETO<br/>[FR] ÉTHERS DE POLYVINYLE ET PROCÉDÉS S'Y RAPPORTANT
申请人:UNIV NORTH CAROLINA CHAPEL HILL
公开号:WO2020037163A1
公开(公告)日:2020-02-20
Disclosed herein are isotactic polyvinyl ethers and improved methods of making same. The method disclosed herein can produce polyvinyl ethers having a higher isotacticity as compared to polyvinyl ethers prepared with conventional methods.
Asymmetric synthesis catalyst based on chiral brsnsted acid and method of asymmetric synthesis with the catalyst
申请人:Akiyama Takahiko
公开号:US20060276329A1
公开(公告)日:2006-12-07
A compound usable as an asymmetric synthesis catalyst which can be easily synthesized without using any metal such as a lanthanoid group element; a method of asymmetric synthesis with the compound; and a chiral compound obtained by the asymmetric synthesis method. A Broensted acid is used as a catalyst in asymmetric synthesis, the chiral Broensted acid being represented by formula (1) below or formula (3) below. The asymmetric synthesis method employs the catalyst. Asymmetric synthesis with the catalyst gives a chiral compound.