Manipulating Micellar Environments for Enhancing Transition Metal-Catalyzed Cross-Couplings in Water at Room Temperature
作者:Bruce H. Lipshutz、Subir Ghorai、Wendy Wen Yi Leong、Benjamin R. Taft、Daniel V. Krogstad
DOI:10.1021/jo200746y
日期:2011.6.17
The remarkable effects of added salts on the properties of aqueous micelles derived from the amphiphile PTS are described. Most notably, Heck reactions run in the presence of NaCl lead to couplings on aryl bromides in water at roomtemperature. Olefin cross- and ring-closingmetathesis reactions run in the presence of small amounts of pH-lowering KHSO4 are also accelerated, another phenomenon that
Rate Enhanced Olefin Cross-Metathesis Reactions: The Copper Iodide Effect
作者:Karl Voigtritter、Subir Ghorai、Bruce H. Lipshutz
DOI:10.1021/jo200360s
日期:2011.6.3
Copper iodide has been shown to be an effective cocatalyst for the olefin cross-metathesis reaction. In particular, it has both a catalyst stabilizing effect due to iodide ion, as well as copper(I)-based phosphine-scavenging properties that apply to use of the Grubbs-2 catalyst. A variety of Michael acceptors and olefinic partners can be cross-coupled under mild conditions in refluxing diethyl ether
Olefin Cross-Metathesis Reactions at Room Temperature Using the Nonionic Amphiphile “PTS”: Just Add Water
作者:Bruce H. Lipshutz、Grant T. Aguinaldo、Subir Ghorai、Karl Voigtritter
DOI:10.1021/ol800028x
日期:2008.4.1
cross-metathesis reactions in water, involving water-insoluble substrates, at roomtemperature and using commercially available catalysts are reported. The key to success is to include small percentages of the nonionic, vitamin E-based amphiphile "PTS". The nanometermicelles formed accommodate water-insoluble substrates, along with a readily available Ru-based metathesis catalyst. Reactions proceed
The C53-C67 and C53-C65 polyene fragments of amphidinols have been synthesized in an efficient and convergent fashion from sorbic acid in good overall yields (30-31%) by employing a chemoselective cross-metathesis of a Weinreb amide and a Julia-Kocienski olefination as the key steps.
[EN] WATER SOLUBLE OLEFIN METATHESIS<br/>[FR] MÉTATHÈSE D'OLÉFINES HYDROSOLUBLES
申请人:UNIV CALIFORNIA
公开号:WO2009009597A1
公开(公告)日:2009-01-15
This invention provides a composition comprising (a) a catalyst; and (b) a solubilizing agent, wherein the catalyst is utilized in a metathesis reaction.