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.
Study of the regio- and enantioselectivity of the reactions of osmium tetroxide with allylic alcohols and allylic sulfonamides
作者:Daqiang Xu、Christine Y. Park、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)77153-x
日期:1994.4
geranyl sulfonamides suggest the presence of a moderate attractive interaction between OsO4 and the allylic groups bearing acidic protons. This allylic directing effect may be due to the development of a hydrogen bonding interaction between OsO4 and the substrates during the osmylation process. The potential for a hydrogen bond can also have a substantial effect on the enantioselectivities of the osmium