Three-component vicinal-diarylation of alkenes <i>via</i> direct transmetalation of arylboronic acids
作者:Yun Zhang、Gong Chen、Dongbing Zhao
DOI:10.1039/c9sc02182e
日期:——
Herein, we report three-component vicinal-diarylation of non-conjugated alkenes initiated by transmetalation of arylboronic acids, which provides complementary access to β,γ-diaryl carbonyl compounds. We have also screened a large number of chiral ligands for developing an enantioselective version of this reaction and obtained the preliminary results (up to 79 : 21 e.r.). Notably, the methodology developed
Pd(II)-catalyzed Chelation-assisted Cross Dehydrogenative Coupling between Unactivated C(sp<sup>3</sup>)–H Bonds in Aliphatic Amides and Benzylic C–H Bonds in Toluene Derivatives
作者:Teruhiko Kubo、Yoshinori Aihara、Naoto Chatani
DOI:10.1246/cl.150615
日期:2015.10.5
The chelation-assisted crossdehydrogenativecoupling of C(sp3)–H bonds is achieved by the Pd(II)-catalyzed reaction of aliphatic amides that contain a 5-chloro-8-aminoquinoline moiety as the direc...
We describe herein a regioselective palladium(II)-catalyzedintermolecularhydroarylation of unactivated aliphatic alkenes with electronically and sterically diverse (hetero)arylsilanes under redox-neutral conditions. A removable bidentate 8-aminoquinoline auxiliary was readily employed to dictate the regioselectivity, prevent β-hydride elimination, and facilitate protodepalladation. This silicon-based
Palladium(<scp>ii</scp>)-catalyzed γ-selective hydroarylation of alkenyl carbonyl compounds with arylboronic acids
作者:Rei Matsuura、Tanner C. Jankins、David E. Hill、Kin S. Yang、Gary M. Gallego、Shouliang Yang、Mingying He、Fen Wang、Rohan P. Marsters、Indrawan McAlpine、Keary M. Engle
DOI:10.1039/c8sc03081b
日期:——
A catalytic γ-selective syn-hydroarylation of alkenyl carbonyl compounds using arylboronic acids has been developed using a substrate directivity approach with a palladium(II) catalyst. This method tolerates a wide range of functionalized (hetero)arylboronic acids and a variety of substitution patterns on the alkene. Preliminary mechanistic studies suggest that transmetalation is rate-limiting.
使用芳基硼酸对烯基羰基化合物进行催化γ-选择性顺式加氢芳基化反应,采用底物方向性方法和钯( II )催化剂进行开发。该方法可耐受多种官能化(杂)芳基硼酸和烯烃上的多种取代模式。初步机制研究表明金属转移是限速的。
Nickel-Catalyzed β,γ-Dicarbofunctionalization of Alkenyl Carbonyl Compounds via Conjunctive Cross-Coupling
作者:Joseph Derosa、Van T. Tran、Mark N. Boulous、Jason S. Chen、Keary M. Engle
DOI:10.1021/jacs.7b06567
日期:2017.8.9
A nickel-catalyzed conjunctive cross-coupling between non-conjugated alkenes, aryl iodides, and alkylzinc reagents is reported. Excellent regiocontrol is achieved utilizing an 8-aminoquinoline directing group that can be readily cleaved to unmask net β,γ-dicarbofunctionalized carboxylic acid products. Under optimized conditions, both terminal and internal alkene substrates provided the corresponding