Copper + Nickel-in-Charcoal (Cu−Ni/C): A Bimetallic, Heterogeneous Catalyst for Cross-Couplings
作者:Bruce H. Lipshutz、Danielle M. Nihan、Ekaterina Vinogradova、Benjamin R. Taft、Žarko V. Bošković
DOI:10.1021/ol801676u
日期:2008.10.2
catalyst composed of copper and nickel oxide particles supported within charcoal has been developed. It catalyzes cross-couplings that traditionally use palladium, nickel, or copper, including Suzuki-Miyaura reactions, Buchwald-Hartwig aminations, vinylalane alkylations, etherifications of arylhalides, arylhalide reductions, asymmetric conjugate reductions of activated olefins, and azide-alkyne "click"
Heterogeneous Catalysis: Ni/C-Catalyzed
Cross-Couplings <i>en route</i> to Allylated Aromatics:
Application to a Precursor to Coenzyme Q<sub>10</sub>
作者:Bruce Lipshutz、Bryan Frieman、Steven Pfeiffer
DOI:10.1055/s-2002-34384
日期:——
The readily available, heterogeneous, and inexpensive catalyst nickel-on-charcoal (Ni/C) can be used to mediate couplings between vinyl alanes and benzylic chlorides under very mild conditions and in good yields. Although such allylated aromatics are themselves important compounds, as demonstrated in this work, their syntheses under the ‘green chemistry’ conditions used can smoothly arrive at precursors to valued quinone natural products, such as the nutraceutical coenzyme Q10.
CARBOMETALLATION OF ALKYNES AND IMPROVED SYNTHESIS OF UNIQUINONES
申请人:Lipshutz H. Bruce
公开号:US20080086013A1
公开(公告)日:2008-04-10
Methods for the carbometallation of alkynes are presented. Those are useful for the synthesis of CoQ
10
and other ubiquinones as well as for the synthesis of ubiquinol analogs.
The present invention provides a convergent method for the synthesis of ubiquinones and ubiquinone analogues. Also provided are precursors of ubiquinones and their analogues that are useful in the methods of the invention.
Controlling Regiochemistry in Negishi Carboaluminations. Fine Tuning the Ligand on Zirconium
作者:Bruce H. Lipshutz、Tom Butler、Asher Lower
DOI:10.1021/ja065769b
日期:2006.12.1
The species on the zirconocene catalyst is changed from two Cp's to the Brintzinger ligand and catalytic amounts of MAO are used to usually effect a >99% regiocontrol of Negishi carboaluminations of 1-alkynes in toluene.