A mild and efficient protocol for the synthesis of 2,2′-difunctional biaryls from readily available benzamides and oximes by Co(OAc)2·4H2O catalysis has been developed. The catalytic cycle that includes aerobic oxidation of Co(I) to Co(III) is successfully achieved for the first time through dual-chelation-assisted C–H/C–H coupling with the assistance of catalytic Mn(acac)3. The catalytic system exhibits
An Electrochemical Beckmann Rearrangement: Traditional Reaction via Modern Radical Mechanism
作者:Li Tang、Zhi‐Lv Wang、Yan‐Hong He、Zhi Guan
DOI:10.1002/cssc.202001553
日期:2020.9.18
electrochemical Beckmannrearrangement, i. e. the direct electrolysis of ketoximes to amides, is presented for the first time. Using a constant current as the driving force, the reaction can be easily carried out under neutral conditions at room temperature. Based on a series of mechanistic studies, a novel radical Beckmannrearrangementmechanism is proposed. This electrochemical Beckmannrearrangement does
Dehydrative Beckmann rearrangement and the following cascade reactions
作者:Yongjiao Wei、Yinghui Liu、Lan-Gui Xie
DOI:10.1016/j.cclet.2021.10.020
日期:2022.5
The Beckmannrearrangement has been predominantly studied for the synthesis of amide and lactam. By strategically using the in situ generated Appel's salt or Mitsunobu's zwitterionic adduct as the dehydrating agent, a series of Beckmannrearrangement and following cascade reactions have been developed herein. The protocol allows the conversion of various ketoximes into amide, thioamide, tetrazole and
Structure-activity analysis of a class of orally active hydroxamic acid inhibitors of leukotriene biosynthesis
作者:James B. Summers、Bruce P. Gunn、Jonathan G. Martin、Michael B. Martin、Hormoz Mazdiyasni、Andrew O. Stewart、Patrick R. Young、Jennifer B. Bouska、Andrew M. Goetze
DOI:10.1021/jm00118a016
日期:1988.10
in vivo leukotrienebiosynthesis inhibitory potency for a group of these hydroxamicacids were investigated. While most of the compounds examined were potent in vitro inhibitors of 5-lipoxygenase, their in vivo potencies varied widely. This discrepancy was usually attributable to differences in bioavailability. Substitution patterns are described that produce potent, orallyactiveinhibitors of leukotriene
Herein, we report a Rh(III)-catalyzeddirect alkenylation of arenes with readily available vinyltrifluoroborate to directaccess to functionalized styrenes. This method tolerates a wide range of functional groups in 33 examples with excellent site- and regioselectivity under mild conditions. The synthetic utility was demonstrated through the further transformation of thus-obtained functionalized styrenes