A versatile and highly stereocontrolled synthetic approach to homochiral polyfunctional norbornene and norbornane derivatives
作者:Ramon Casas、Javier Ibarzo、José M. Jiménez、Rosa M. Ortuño
DOI:10.1016/s0957-4166(00)80174-3
日期:1993.4
chiral precursor. The target molecules include pairs of enantiomers and their configuration has mainly been assured by controlling the facial and the endo/exo diastereoselectivity in the Diels-Alderreactions of chiral cyclic or acyclic dienophiles. Some of the products obtained are key intermediates in the synthesis of biologically active compounds.
Bifunctional organocatalyst for methanolytic desymmetrization of cyclic anhydrides: increasing enantioselectivity by catalyst dilution
作者:Ho Sik Rho、Sang Ho Oh、Ji Woong Lee、Jin Yong Lee、Jik Chin、Choong Eui Song
DOI:10.1039/b719811f
日期:——
Highlyenantioselective methanolysis of meso-cyclic anhydride was achieved with bifunctionalorganocatalyst containing a quinine-thiourea moiety; unusual concentration, temperature and solvent effects on the enantioselectivity can be explained in terms of a mechanism involving monomer-dimer equilibration of the catalyst.
Simple and Highly Enantioselective Nonenzymatic Ring Opening of Cyclic Prochiral Anhydrides
作者:Carsten Bolm、Arne Gerlach、Christian L. Dinter
DOI:10.1055/s-1999-2570
日期:1999.2
A convenient highly enantioselective methanolysis of cyclic meso-anhydrides only requires one equivalent cinchona alkaloid and low temperature. Both enantiomers can be easily obtained with up to 98% ee by using either quinine or quinidine.
A polymer-supported Cinchona-based bifunctional sulfonamide catalyst: a highly enantioselective, recyclable heterogeneous organocatalyst
作者:Sung Hun Youk、Sang Ho Oh、Ho Sik Rho、Je Eun Lee、Ji Woong Lee、Choong Eui Song
DOI:10.1039/b821483b
日期:——
The design, synthesis, and catalytic application of a highly enantioselective and indefinitely stable polymer-supported Cinchona-based bifunctional sulfonamide is reported.
CINCHONA-BASED BIFUNCTIONAL ORGANOCATALYSTS AND METHOD FOR PREPARING CHIRAL HEMIESTERS USING THE SAME
申请人:SONG Choong Eui
公开号:US20110213151A1
公开(公告)日:2011-09-01
The present invention relates to cinchona-based bifunctional organocatalysts and methods for preparing chiral hemiesters using the same. More specifically, the present invention relates to methods for preparing chiral hemiesters from prochiral or meso cyclic acid anhydrides via desymmetrization, using bifunctional cinchona alkaloid catalysts comprising sulfonamide functional groups.