Palladium charcoal-catalyzed deprotection of O-allylphenols
摘要:
Allyl aryl ethers can be easily cleaved by the use of 10% Pd/C under mild and basic conditions. The present reaction would involve a SET process rather than a pi-allyl-palladium complex. The scope and limitation of this new deprotective methodology is also described. (C) 2004 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Intermolecular Trifluoromethylazidation of Alkenes: Convenient Access to CF<sub>3</sub>-Containing Alkyl Azides
作者:Fei Wang、Xiaoxu Qi、Zhaoli Liang、Pinhong Chen、Guosheng Liu
DOI:10.1002/anie.201309991
日期:2014.2.10
A novel copper‐catalyzed intermoleculartrifluoromethylazidation of alkenes has been developed under mild reaction conditions. A variety of CF3‐containing organoazides were directly synthesized from a wide range of olefins, including activated and unactivated alkenes, and the resulting products can be easily transformed into the corresponding CF3‐containing amine derivatives.
Triton B–Mediated Efficient and Convenient Alkoxylation of Activated Aryl and Heteroaryl Halides
作者:H. M. Meshram、P. Ramesh Goud、B. Chennakesava Reddy、D. Aravind Kumar
DOI:10.1080/00397910903219518
日期:2010.6.25
simple and convenient one-pot synthesis of aryl alkyl ethers by the alkoxylation of arylhalides with alcohol in the presence of Triton B as a base is described. The procedure is applicable for a variety of aryl and heteroarylhalides, and yields are very good. The use of a nonmetallic base and solvent-free conditions are important features of the reaction.
描述了在 Triton B 作为碱的存在下,通过芳基卤化物与醇的烷氧基化,简单方便地一锅法合成芳基烷基醚。该方法适用于多种芳基和杂芳基卤化物,收率非常好。使用非金属碱和无溶剂条件是反应的重要特征。
Base-Induced Radical Carboamination of Nonactivated Alkenes with Aryldiazonium Salts
作者:Stephanie Kindt、Karina Wicht、Markus R. Heinrich
DOI:10.1021/acs.orglett.5b03143
日期:2015.12.18
transition-metal-free version of the Meerweinarylation has been developed. The key feature of this carboamination-type reaction is the slow base-controlled generation of arylradicalsfrom aryldiazonium tetrafluoroborates, so that a sufficient quantity of diazonium ions remains to enable efficient trapping of the alkyl radical adduct resulting fromarylradical addition to the alkene. Under strongly
Palladium-Catalyzed Intermolecular Azidocarbonylation of Alkenes via a Cooperative Strategy
作者:Ming Li、Feng Yu、Pinhong Chen、Guosheng Liu
DOI:10.1021/acs.joc.7b01812
日期:2017.11.17
alkene activation and palladium-catalyzed carbonylation was demonstrated as an efficient strategy for the difunctionalization of alkenes. A variety of β-azido carboxylic esters were obtained from mono- and 1,1-disubstituted terminal alkenes with excellent regioselectivities. In addition, the introduced azido group can be reduced to an amine group, providing a facile access to β-aminoacid derivatives
2‐Fluoro‐5‐nitrophenyldiazonium: A Novel Sanger‐Type Reagent for the Versatile Functionalization of Alcohols
作者:Oliver Fischer、Markus R. Heinrich
DOI:10.1002/chem.202100187
日期:2021.3.22
As a novel Sanger‐type reagent, 2‐fluoro‐5‐nitrophenyldiazonium tetrafluoroborate enabled the versatile functionalization of primary and secondary aliphatic alcohols. Based on a mild nucleophilic aromatic substitution of the fluorine atom under unprecedented, base‐free conditions, the diazonium unit on the aromatic core of the resulting aryl‐alkyl ether could be employed for such diverse transformations