Iron-Catalyzed Alkylation of Nitriles with Alcohols
作者:Wei Ma、Suya Cui、Huamin Sun、Weijun Tang、Dong Xue、Chaoqun Li、Juan Fan、Jianliang Xiao、Chao Wang
DOI:10.1002/chem.201803762
日期:2018.9.6
A general, efficient iron‐catalyzedα‐alkylation of nitriles with primary alcohols through a hydrogen‐borrowing pathway has been developed, allowing a wide variety of alkylated nitriles to be readily accessible. Detailed mechanistic studies suggest that the reaction proceeds via an olefin intermediate with the turnover rate limited by the hydrogenation of the olefin with an iron hydride. Apart from
Studies in Polyphenol Chemistry and Bioactivity. 2.<sup>1</sup> Establishment of Interflavan Linkage Regio- and Stereochemistry by Oxidative Degradation of an <i>O</i>-Alkylated Derivative of Procyanidin B<sub>2</sub> to (<i>R</i>)-(−)-2,4-Diphenylbutyric Acid
作者:Alan P. Kozikowski、Werner Tückmantel、Clifford George
DOI:10.1021/jo000485+
日期:2000.8.1
The assignment of interflavanbondregio- and stereochemistry in oligomeric proanthocyanidins has in the past relied on empirical spectroscopic techniques which are influenced by the conformation of the C rings. Only recently was the 4,8-regiochemistry of procyanidin B2 (3b) firmly established by 2-dimensional NMR methods. We describe herein the proof of 4beta-stereochemistry in 3b by oxidative degradation
[cyano, nitro, (non)enolizable ketone, chloride, and amide moieties] are allowed on methoxyarenes. Moreover, an array of alkanenitriles with/without an aryl moiety at the nitrile α-position can be employed. The system also features no requirement of a stoichiometric base, MeOH (not salt waste) formation as a byproduct, and the production of congested quaternary carbon centers.
Synthesis of α-Aryl Esters and Nitriles: Deaminative Coupling of α-Aminoesters and α-Aminoacetonitriles with Arylboronic Acids
作者:Guojiao Wu、Yifan Deng、Chaoqiang Wu、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201406765
日期:2014.9.22
Transition‐metal‐free synthesis of α‐arylesters and nitriles using arylboronicacids with α‐aminoesters and α‐aminoacetonitriles, respectively, as the starting materials has been developed. The reaction represents a rare case of converting C(sp3)N bonds into C(sp3)C(sp2) bonds. The reaction conditions are mild, demonstrate good functional‐group tolerance, and can be scaled up.