A transition-metal-free Heck-type reaction between alkenes and alkyl iodides enabled by light in water
作者:Wenbo Liu、Lu Li、Zhengwang Chen、Chao-Jun Li
DOI:10.1039/c5ob00515a
日期:——
A transition-metal-free coupling protocol between various alkenes and non-activated alkyl iodides has been developed by using photoenergy in water for the first time. Under UV irradiation and basic aqueous conditions, various alkenes efficiently couple with a wide range of non-activated alkyl iodides. A tentative mechanism, which involves an atom transfer radical addition process, for the coupling
Copper- and Nickel-Catalyzed Cross-Coupling Reaction of Monofluoroalkenes with Tertiary, Secondary, and Primary Alkyl and Aryl Grignard Reagents
作者:Hongyan Shi、Wenpeng Dai、Biyun Wang、Song Cao
DOI:10.1021/acs.organomet.7b00859
日期:2018.2.12
with tertiary, secondary, and primary alkyl and aryl Grignardreagents in the presence of a catalytic amount of copper or nickel catalyst, respectively, has been developed. The reactions proceeded smoothly at room temperature, providing (E)-alkene isomers in moderate to high yields. Plausible mechanisms of the Ni-catalyzed coupling reaction of monofluoroalkene with Grignardreagents are suggested.
Photocatalytic Synthesis of Dihydrobenzofurans by Oxidative [3+2] Cycloaddition of Phenols
作者:Travis R. Blum、Ye Zhu、Sarah A. Nordeen、Tehshik P. Yoon
DOI:10.1002/anie.201406393
日期:2014.10.6
We report a protocol for oxidative [3+2] cycloadditions of phenols and alkenesapplicable to the modular synthesis of a large family of dihydrobenzofuran natural products. Visible‐light‐activated transition metal photocatalysis enables the use of ammonium persulfate as an easily handled, benign terminal oxidant. The broad range of organic substrates that are readily oxidized by photoredox catalysis
Analyzing Site Selectivity in Rh<sub>2</sub>(esp)<sub>2</sub>-Catalyzed Intermolecular C–H Amination Reactions
作者:Elizabeth N. Bess、Ryan J. DeLuca、Daniel J. Tindall、Martins S. Oderinde、Jennifer L. Roizen、J. Du Bois、Matthew S. Sigman
DOI:10.1021/ja5015508
日期:2014.4.16
Predicting site selectivity in C–H bond oxidation reactions involving heteroatom transfer is challenged by the small energetic differences between disparate bond types and the subtle interplay of steric and electronic effects that influence reactivity. Herein, the factorsgoverningselective Rh2(esp)2-catalyzed C–H amination of isoamylbenzene derivatives are investigated, where modification to both
[EN] HALOGEN-CONTAINING METATHESIS CATALYSTS AND METHODS THEREOF<br/>[FR] CATALYSEURS DE MÉTATHÈSE CONTENANT DE L'HALOGÈNE ET PROCÉDÉS ASSOCIÉS
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2018013943A1
公开(公告)日:2018-01-18
The present disclosure provides compounds, compositions, and methods for preparing alkenyl halides and/or haloalkyl-substituted olefins with Z-selectivity. The methods are particularly useful for preparing alkenyl fluorides such as CF3-substituted olefins by means of cross-metathesis reactions using halogen-containing molybdenum and tungsten complexes.