Lewis Base Activation of Lewis Acids: Catalytic, Enantioselective Addition of Silyl Ketene Acetals to Aldehydes
作者:Scott E. Denmark、Gregory L. Beutner、Thomas Wynn、Martin D. Eastgate
DOI:10.1021/ja047339w
日期:2005.3.1
The concept of Lewisbase activation of Lewisacids has been reduced to practice for catalysis of the aldolreaction of silyl ketene acetals and silyl dienol ethers with aldehydes. The weakly acidic species, silicon tetrachloride (SiCl4), can be activated by binding of a strongly Lewis basic chiral phosphoramide, leading to in situ formation of a chiral Lewisacid. This species has proven to be a competent
A Modified and Highly Useful Protocol for the Brønsted Acid Catalyzed, Enantioselective, Vinylogous Mannich Reaction with Aliphatic Aldimines
作者:Christoph Schneider、Falko Abels
DOI:10.1055/s-0031-1289303
日期:2011.12
Highly enantioselective as well as diastereoselective catalytic vinylogousMannichreactions have been accomplished for the first time with aliphatic straight-chain aldimines and O,O-silylketene acetals and furnish valuable synthetic building blocks in high enantiomeric purity. vinylogousMannichreaction - phosphoric acid - organocatalyis - contact ion pair - dienolate - BINOL
Scandium(III)‐Zeolites as New Heterogeneous Catalysts for Imino‐Diels–Alder Reactions
作者:Andrea Olmos、Benoit Louis、Patrick Pale
DOI:10.1002/chem.201103624
日期:2012.4.16
demonstrates the first zeolite‐catalyzed synthesis of piperidine derivatives, including peptidomimetics and indoloquinolizidine alkaloids. The approach developed utilizes a highly effective one‐pot reaction cascade, through imine formation and imino‐Diels–Alderreactions, promoted by scandium‐loaded zeolites as a heterogeneouscatalyst. The methodology described benefits from very low catalyst loadings (≤5 mol %
The first catalytic, enantioselectivevinylogousMannichreaction of acyclic silyl dienolates is reported. A second‐generation 2,2′‐dihydroxy‐1,1′‐binaphthyl (BINOL)‐based phosphoric acid has been developed and further optimized as an enantioselective organocatalyst. Upon protonation of the imines, chiral contact ion pairs are generated in situ and attacked highly diastereoselectively by the nucleophile
[EN] POCHOXIME CONJUGATES USEFUL FOR THE TREATMENT OF HSP90 RELATED PATHOLOGIES<br/>[FR] DÉRIVÉS DE POCHOXIME CONVENANT POUR LE TRAITEMENT DE PATHOLOGIES EN RAPPORT AVEC HSP90
申请人:UNIV STRASBOURG
公开号:WO2012052843A1
公开(公告)日:2012-04-26
The present invention includes novel derivatives, analogs, and intermediates of the natural products radicicol, pochonins, pochoximes, and their syntheses. The present invention also provides a pharamceutical composition comprising the present compound and the use of the compound as inhibitors of kinases and of the enzyme family known as heat shock protein 90 (HSP90).