Nickel-Catalyzed Efficient and Practical Suzuki−Miyaura Coupling of Alkenyl and Aryl Carbamates with Aryl Boroxines
作者:Li Xu、Bi-Jie Li、Zhen-Hua Wu、Xing-Yu Lu、Bing-Tao Guan、Bi-Qin Wang、Ke-Qing Zhao、Zhang-Jie Shi
DOI:10.1021/ol9029534
日期:2010.2.19
Suzuki−Miyaura coupling of unactivated alkenyl carbamates is described to construct polysubstituted olefins. The developed process is also suitable for heteroaromatic and even electron-richaromatic carbamates.
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,
CH Alkenylations with Alkenyl Acetates, Phosphates, Carbonates, and Carbamates by Cobalt Catalysis at 23 °C
作者:Marc Moselage、Nicolas Sauermann、Sven C. Richter、Lutz Ackermann
DOI:10.1002/anie.201412319
日期:2015.5.18
N‐heterocyclic carbene ligands enable direct arene alkenylations with easily accessible alkenyl acetates through regioselective CH/CO functionalizations in a stereoconvergent fashion. The versatile cobalt catalyst was broadly applicable and thus also allowed for the efficient conversion of alkenyl phosphates, carbonates, and carbamates at ambient temperature.
便宜的钴催化剂与N-杂环碳烯配体能够通过区域选择性下用容易获得的烯基乙酸酯直接芳烃alkenylations H / C Ò官能化以stereoconvergent方式。通用的钴催化剂具有广泛的用途,因此也可以在环境温度下有效地转化烯基磷酸盐,碳酸盐和氨基甲酸酯。
Using Rh(III)-Catalyzed C–H Activation as a Tool for the Selective Functionalization of Ketone-Containing Molecules
作者:Mélissa Boultadakis-Arapinis、Matthew N. Hopkinson、Frank Glorius
DOI:10.1021/ol500258q
日期:2014.3.21
Due to the strong potential of C H activation in many areas of organic chemistry, the use of a pre-existing carbonyl group for the installation of a directing group to enable selective and predictable alpha-alkenylation with activated olefins as coupling partners is described. This Heck-type reaction would then lead either to beta,gamma-unsaturated ketones or to variously substituted 1,4-butadienes depending on the conditions used for the cleavage of the directing group.
External‐Photocatalyst‐Free Visible‐Light‐Mediated Synthesis of Indolizines
作者:Basudev Sahoo、Matthew N. Hopkinson、Frank Glorius
DOI:10.1002/anie.201506868
日期:2015.12.14
A visible‐light‐mediatedsynthesis of valuable polycyclic indolizine heterocycles from easily accessed brominated pyridine and enol carbamate derivatives has been developed. This process, which operates at room temperature under irradiation from readily available light sources, does not require the addition of an external photocatalyst. Instead, an investigation into the reaction mechanism indicates