α,β-Unsaturated β-Silyl Imide Substrates for Catalytic, Enantioselective Conjugate Additions: A Total Synthesis of (+)-Lactacystin and the Discovery of a New Proteasome Inhibitor
作者:Emily P. Balskus、Eric N. Jacobsen
DOI:10.1021/ja061970a
日期:2006.5.1
Chiral (salen)Al mu-oxo dimer 1 catalyzes the highly enantioselective conjugateaddition of carbon-centered nucleophiles to alpha,beta-unsaturated silyl imides. Allyldimethylsilane-substituted imide 4 was identified as an optimal substrate, undergoing addition reactions with a variety of nitrile nucleophiles in high yield and enantiomeric excess. The silicon-containing products are synthetically useful
Enantioselective Michael Additions to α,β-Unsaturated Imides Catalyzed by a Salen−Al Complex
作者:Mark S. Taylor、Eric N. Jacobsen
DOI:10.1021/ja037177o
日期:2003.9.1
conjugate addition of di- and trisubstituted nitriles to a wide range of acyclic alkyl- and aryl-substituted α,β-unsaturated imides. This new methodology provides access to multifunctional compounds that previously have not been readily accessible in enantioenriched form. Synthetic applications of these products include the preparation of enantiomerically enriched piperidines, as exemplified by an expedient
attracted tremendous attention in the field of photocatalysis, owing to their superior optoelectronic properties for photocatalytic reactions, including high absorption coefficients and long photogenerated carrier lifetimes. Herein, by choosing 2‐(3,4‐dimethoxyphenyl)‐3‐oxobutanenitrile as a model substrate, we demonstrate that the stereoselective (>99 %) C−C oxidative coupling reaction can be realized with