A Versatile Route to Unstable Diazo Compounds via Oxadiazolines and their Use in Aryl-Alkyl Cross-Coupling Reactions
作者:Andreas Greb、Jian-Siang Poh、Stephanie Greed、Claudio Battilocchio、Patrick Pasau、David C. Blakemore、Steven V. Ley
DOI:10.1002/anie.201710445
日期:2017.12.22
Coupling of readily available boronicacids and diazo compounds has emerged recently as a powerful metal-free carbon-carbon bond forming method. However, the difficulty in forming the unstable diazo compound partner in a mild fashion has hitherto limited their general use and the scope of the transformation. Here, we report the application of oxadiazolines as precursors for the generation of an unstable
Hydrogen‐Bonding Catalyzed Ring‐Closing C−O/C−O Metathesis of Aliphatic Ethers over Ionic Liquid under Metal‐Free Conditions
作者:Huan Wang、Yanfei Zhao、Fengtao Zhang、Yunyan Wu、Ruipeng Li、Junfeng Xiang、Zhenpeng Wang、Buxing Han、Zhimin Liu
DOI:10.1002/anie.202004002
日期:2020.7.13
have wide applications, and their efficient and green synthesis is very interesting. Herein, we report hydrogen‐bonding catalyzed ring‐closing metathesis of aliphatic ethers to O‐heterocycles over ionic liquid (IL) catalyst under metal‐ and solvent‐free conditions. The IL 1‐butylsulfonate‐3‐methylimidazolium trifluoromethanesulfonate ([SO3H‐BMIm][OTf]) is discovered to show outstanding performance, better
Among all metathesisreactions known to date in organic chemistry, the metathesis of multiple bonds such as alkenes and alkynes has evolved into one of the most powerful methods to construct molecular complexity. In contrast, metathesisreactions involving single bonds are scarce and far less developed, particularly in the context of synthetically valuable ring‐closing reactions. Herein, we report
A Practical Method for Continuous Production of sp3‐Rich Compounds from (Hetero)Aryl Halides and Redox‐Active Esters
作者:Eiichi Watanabe、Yiding Chen、Oliver May、Steven V. Ley
DOI:10.1002/chem.201905048
日期:2020.1.2
practically useful coupling reaction between aromatic halides and redox-active esters was realized by nickel catalysis through the use of a packed zinc bed column in continuous flow. Multiple reuse of the column showed a negligible decrease in efficiency, affording high space/time yields. A wide range of substrates, including a number of heteroaryl halides and polyfunctional materials were coupled in generally
Deaminative Reductive Arylation Enabled by Nickel/Photoredox Dual Catalysis
作者:Jun Yi、Shorouk O. Badir、Lisa Marie Kammer、María Ribagorda、Gary A. Molander
DOI:10.1021/acs.orglett.9b01097
日期:2019.5.3
Described is a cross-electrophilic, deaminative coupling strategy harnessing Katritzky salts as a new species of electrophile in Ni/photoredoxdual catalytic reductive cross-coupling reactions. Distinguishing features of this arylation protocol include its mild reaction conditions, high chemoselectivity, and adaptability to a variety of complex substrates [i.e., pyridinium salts derived from amines