Copper
<scp>porphyrin‐catalyzed</scp>
C(sp
<sup>2</sup>
)
<b>—</b>
O bond construction via coupling phenols with formamides
作者:Shuang Yang、Xiao‐Yan Chen、Ming‐Feng Xiong、Hao Zhang、Lei Shi、Dong‐Zi Lin、Hai‐Yang Liu
DOI:10.1002/jccs.202100046
日期:2021.8
construction of C(sp2)—Obond via coupling formamides with phenols was achieved firstly. A broad range of substrates afforded various carbamates in moderate to good yields with good functional group tolerance at low catalyst loading. Intermolecular competing kinetic isotope effect experiment indicated that the generation of formamide radical is the rate-determining step of current cross-dehydrogenative coupling
Pd(<scp>ii</scp>) catalyzed ortho C–H iodination of phenylcarbamates at room temperature using cyclic hypervalent iodine reagents
作者:Xiuyun Sun、Xia Yao、Chao Zhang、Yu Rao
DOI:10.1039/c5cc02533h
日期:——
The first example to access ortho iodinated phenols using cyclic hypervalent iodine(iii) reagents through palladium(ii) catalyzed C–H activation has been developed via weak coordination. The reaction showed excellent regioselectivity, reactivity and good functional group tolerance. A unique mechanism was proposed.
Nickel-Catalyzed Defluorinative Reductive Cross-Coupling of <i>gem</i>-Difluoroalkenes with Unactivated Secondary and Tertiary Alkyl Halides
作者:Xi Lu、Yan Wang、Ben Zhang、Jing-Jing Pi、Xiao-Xu Wang、Tian-Jun Gong、Bin Xiao、Yao Fu
DOI:10.1021/jacs.7b06469
日期:2017.9.13
Herein, we described a nickel-catalyzed monofluoroalkenylation through defluorinative reductive cross-coupling of gem-difluoroalkenes with alkyl halides. Key to the success of this strategy is the combination of C-F cleavage with alkyl halides activation. This reaction enables the convenient synthesis of a large variety of functionalized monofluoroalkenes under mild reaction conditions with broad functional
在此,我们描述了通过嵴二氟烯烃与烷基卤化物的脱氟还原交叉偶联实现的镍催化的单氟烯基化反应。该策略成功的关键是将 CF 裂解与烷基卤化物活化相结合。该反应能够在温和的反应条件下方便地合成多种官能化的单氟烯烃,具有广泛的官能团兼容性和优异的 Z 选择性。Ni 催化与 (Bpin)2/K3PO4 作为末端还原剂的结合促进了 C(sp2)-C(sp3) 的有效形成,尤其是具有高化学选择性的全碳四元中心的生成。
Design, synthesis, biological evaluation, and molecular modeling studies of chalcone-rivastigmine hybrids as cholinesterase inhibitors
作者:Ling Wang、Yu Wang、Yiguang Tian、Jinling Shang、Xiaoou Sun、Hongzhuan Chen、Hao Wang、Wen Tan
DOI:10.1016/j.bmc.2016.11.002
日期:2017.1
acetylcholinesterase and butyrylcholinesterase. Most of the target compounds showed hBChE selective activity in the micro- and submicromolar ranges. The most potent compound 3 exhibited comparable IC50 to the commercially available drug (rivastigmine). To better understand their structure activity relationships (SAR) and mechanisms of enzyme-inhibitor interactions, kinetic and molecular modeling studies including