环palpalated二茂铁亚胺的碳烯加成物已成功地用于各种芳基溴化物与烯烃的Heck反应。在动力学研究,原位13 C NMR光谱研究和汞中毒实验的基础上,提出环钯钯二茂铁亚胺的卡宾加合物催化的Heck反应通过经典的Pd(0)/ Pd(II)循环和这种Palladacycle进行。只是一个具有催化活性的Pd(0)物种的库。
Flexible, dicationic imidazolium salts for<i>in situ</i>application in palladium-catalysed Mizoroki-Heck coupling of acrylates under aerobic conditions
作者:Marilyn Daisy Milton、Parul Garg
DOI:10.1002/aoc.3503
日期:2016.9
incorporating the features of both bidentate chelating O,O ligand and carbene, shows the maximum catalytic activity. A variety of aryl and heteroaryl methyl and ethyl cinnamates were synthesized using these imidazolium salts as preligands. In addition, NMRstudies confirm in situ generation of normal N‐heterocyclic carbenes from the C‐2 position of imidazol‐2‐ylidene ring. The mercury poisoning test was also
Iridium-Catalyzed Enantioselective Allylic Substitution of Aliphatic Esters with Silyl Ketene Acetals as the Ester Enolates
作者:Xingyu Jiang、John F. Hartwig
DOI:10.1002/anie.201704354
日期:2017.7.17
Enantioselective allylic substitution with enolates derived from aliphatic esters under mild conditions remains challenging. Herein we report iridium‐catalyzed enantioselective allylation reactions of silyl ketene acetals, the silicon enolates of esters, to form products containing a quaternary carbon atom at the nucleophile moiety and a tertiary carbon atom at the electrophile moiety. Under relatively
Regioselective Radical Borylation of α,β-Unsaturated Esters and Related Compounds by Visible Light Irradiation with an Organic Photocatalyst
作者:Guosong Li、Guanwang Huang、Ruixia Sun、Dennis P. Curran、Wen Dai
DOI:10.1021/acs.orglett.1c01270
日期:2021.6.4
recently been reported and are still rare. Here we describe a photoredox radical hydroboration of α,β-unsaturatedesters, amides, ketones, and nitriles with NHC-boranes that uses only an organocatalyst and visible light. The conditions are mild, the substrate scope is broad, and the α/β regioselectivity is high. The reaction requires only the organocatalyst; there is no costly metal, and there are no
Synthesis of oxadiazole-2-oxide derivatives as potential drug candidates for schistosomiasis targeting SjTGR
作者:Gongming Li、Qingqing Guo、Chao Feng、Huan Chen、Wenjiao Zhao、Shu Li、Yang Hong、Dequn Sun
DOI:10.1186/s13071-021-04634-4
日期:2021.12
Because of the increasing drug resistance to praziquantel (PZQ), which is the primary drug for schistosomiasis, developing new drugs to treat schistosomiasis is crucial. Oxadiazole-2-oxides have been identified as potential anti-schistosomiasis reagents targeting thioredoxin glutathione reductase (TGR). In this work, one of the oxadiazole-2-oxides derivatives furoxan was used as the lead compound to
σ-Alkylpalladium Intermediates in Intramolecular Heck Reactions:Isolation and Catalytic Activity
作者:Egle M. Beccalli、Elena Borsini、Stefano Brenna、Simona Galli、Micol Rigamonti、Gianluigi Broggini
DOI:10.1002/chem.200902071
日期:2010.2.1
The isolation of σ‐alkylpalladium Heck intermediates, possible when β‐hydride elimination is inhibited, is a rather rare event. Performing intramolecular Heckreactions on N‐allyl‐2‐halobenzylamines in the presence of [Pd(PPh3)4], we isolated and characterized a series of stable bridged palladacycles containing an iodine or bromine atom on the palladium atom. Indolyl substrates were also tested for