Conversion of Carbonyl Compounds to Olefins
<i>via</i>
Enolate Intermediate
作者:Zhi‐Chao Cao、Pei‐Lin Xu、Qin‐Yu Luo、Xiao‐Lei Li、Da‐Gang Yu、Huayi Fang、Zhang‐Jie Shi
DOI:10.1002/cjoc.201800554
日期:2019.8
A general and efficient protocol to synthesize substituted olefins from carbonyl compounds via nickel catalyzed C—O activation of enolates was developed. Besides ketones, aldehydes were also suitable substrates for the presented catalytic system to produce di‐ or tri‐ substituted olefins. It is worth noting that this approach exhibited good tolerance to highly reactive tertiary alcohols, which could
A Mild Dihydrobenzooxaphosphole Oxazoline/Iridium Catalytic System for Asymmetric Hydrogenation of Unfunctionalized Dialins
作者:Bo Qu、Lalith P. Samankumara、Shengli Ma、Keith R. Fandrick、Jean-Nicolas Desrosiers、Sonia Rodriguez、Zhibin Li、Nizar Haddad、Zhengxu S. Han、Keith McKellop、Scott Pennino、Nelu Grinberg、Nina C. Gonnella、Jinhua J. Song、Chris H. Senanayake
DOI:10.1002/anie.201408929
日期:2014.12.22
Air‐stable P‐chiral dihydrobenzooxaphosphole oxazoline ligands were designed and synthesized. When they were used in the iridium‐catalyzed asymmetrichydrogenation of unfunctionalized 1‐aryl‐3,4‐dihydronaphthalenes under one atmosphere pressure of H2, up to 99:1 e.r. was obtained. High enantioselectivities were also observed in the reduction of the exocyclic imine derivatives of 1‐tetralones.
Pd-Catalyzed Cross-Coupling of Highly Sterically Congested Enol Carbamates with Grignard Reagents via C–O Bond Activation
作者:Zicong Chen、Chau Ming So
DOI:10.1021/acs.orglett.0c01127
日期:2020.5.15
The palladium-catalyzed cross-coupling reaction of enol carbamates to construct highly sterically congested alkenyl compounds is presented for the first time. This protocol demonstrates the potential of using thermally stable and highly atom-economic enol electrophiles as building blocks in bulky alkene synthesis. This reaction accommodates a broad substrate scope with excellent Z/E isomer ratios,
Catalytic asymmetric Simmons–Smith cyclopropanation of unfunctionalized olefins
作者:Jiang Long、Haifeng Du、Kai Li、Yian Shi
DOI:10.1016/j.tetlet.2005.02.161
日期:2005.4
This paper describes a catalyticasymmetric cyclopropanation system for unfunctionalized olefins using readily available dipeptide N-Boc-l-Val-l-Pro-OMe (1) as ligand.
Asymmetric Simmons−Smith Cyclopropanation of Unfunctionalized Olefins
作者:Jiang Long、Yi Yuan、Yian Shi
DOI:10.1021/ja030488e
日期:2003.11.1
This paper describes a promising asymmetric cyclopropanation system for unfunctionalized olefins using readily available dipeptide N-Boc-l-Val-l-Pro-OMe as ligand.