Herein, we describe an intermolecular direct branched‐selective α‐alkylation of cyclicketones with simple alkenes as the alkylation agents. Through an enamine‐transition metal cooperative catalysis mode, the α‐alkylation is realized in an atom‐ and step‐economic manner with excellent branched selectivity for preparing β‐branched ketones. Employment of a pair of bulky Brønsted acid and base as additives
Carboxylate-Assisted Ruthenium(II)-Catalyzed Hydroarylations of Unactivated Alkenes through C-H Cleavage
作者:Marvin Schinkel、Ilan Marek、Lutz Ackermann
DOI:10.1002/anie.201208446
日期:2013.4.2
Catalytic: Ruthenium(II)biscarboxylate complexes enabled highly effective hydroarylations of unactivatedalkenesthrough CH bond activation. This method has a broad substrate scope and allowed for versatile functionalizations of highly fluorinated alkenes.
Branched-Selective Intermolecular Ketone α-Alkylation with Unactivated Alkenes via an Enamide Directing Strategy
作者:Dong Xing、Guangbin Dong
DOI:10.1021/jacs.7b08581
日期:2017.10.4
We describe a strategy for intermolecular branched-selective α-alkylation of ketones using simple alkenes as the alkylating agents. Enamides derived from isoindolin-1-one provide an excellent directing template for catalytic activation of ketone α-positions. High branched selectivity is obtained for both aliphatic and aromatic alkenesusing a cationic iridium catalyst. Preliminary mechanistic study
A composition for application to human skin to enhance elasticity contains as active ingredient a sulphur-containing compound of the general formula:
in which M is hydrogen or a water-solubilising cation, X is S,
and Y is alkyl or alkenyl of up to 4 carbon atoms, or else -XY is -SH.
this article is a palladium(II)/copper(II)‐ or palladium(II)‐catalyzed intermolecular cyclization of acrylic acid with alkenes to produce α‐methylene‐γ‐butyrolactone derivatives using molecular oxygen as an environmentally benign oxidant. In this system, the carboxylato, especially trifluoroacetato, or trimethylacetato ligand, plays a quite important role to afford a high catalytic activity by suppressing