Synthesis of Optically Active β- or γ-Alkyl-Substituted Alcohols through Copper-Catalyzed Asymmetric Allylic Alkylation with Organolithium Reagents
作者:Sureshbabu Guduguntla、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1021/jo401536u
日期:2013.9.6
An efficient one-pot synthesis of optically active β-alkyl-substituted alcohols through a tandem copper-catalyzedasymmetricallylicalkylation (AAA) with organolithium reagents and reductive ozonolysis is presented. Furthermore, hydroboration–oxidation following the Cu-catalyzed AAA leads to the corresponding homochiral γ-alkyl-substituted alcohols.
Catalytic asymmetric carbon–carbon bond formation via allylic alkylations with organolithium compounds
作者:Manuel Pérez、Martín Fañanás-Mastral、Pieter H. Bos、Alena Rudolph、Syuzanna R. Harutyunyan、Ben L. Feringa
DOI:10.1038/nchem.1009
日期:2011.5
been developed for asymmetric C–C bond formation to yield single enantiomers from several organometallic reagents. Remarkably, for extremely reactive organolithium compounds, which are among the most broadly used reagents in chemical synthesis, a general catalytic methodology for enantioselective C–C formation has proven elusive, until now. Here, we report a copper-based chiral catalyticsystem that
PROCESS FOR THE SYNTHESIS OF KETONES FROM INTERNAL ALKENES
申请人:CALIFORNIA INSTITUTE OF TECHNOLOGY
公开号:US20140194604A1
公开(公告)日:2014-07-10
The present invention is directed to methods for oxidizing internal olefins to ketones. In various embodiments, each method comprising contacting an organic substrate, having an initial internal olefin, with a mixture of (a) a biscationic palladium salt; and (b) an oxidizing agent; dissolved or dispersed in a solvent system to form a reaction mixture, said solvent system comprising at least one C
2-6
carbon nitrile and optionally at least one secondary alkyl amide, said method conducted under conditions sufficient to convert at least 50 mol % of the initial internal olefin to a ketone, said ketone positioned on a carbon of the initial internal olefin. The transformation occurs at room temperature and shows wide substrate scope. Applications to the oxidation of seed oil derivatives and a bioactive natural product are described.
Regioselective Wacker Oxidation of Internal Alkenes: Rapid Access to Functionalized Ketones Facilitated by Cross-Metathesis
作者:Bill Morandi、Zachary K. Wickens、Robert H. Grubbs
DOI:10.1002/anie.201303587
日期:2013.9.9
Wacka wacka: The title reaction makes use of a wide range of directing groups (DG) to enable the highly regioselective oxidation of alkenes, and occurs predictably at the distal position. Both E and Z alkenes afford valuable functionalized ketones and cross‐metathesis was shown to facilitate the preparation of the starting materials. BQ=benzoquinone.