reactive metabolite N-acetyl-p-benzoquinone imine (NAPQI). We have obtained acetaminophen analogues in 57–99% yields by using aniline derivatives with protected α-amino acids and fatty acids via the corresponding mixed carbonic carboxylic anhydrides in aqueous MeCN. We have also succeeded in synthesizing AM404 analogues in 76–97% yields, which are expected to be promising candidates for reducing hepatotoxicity
Intermediate formation enabled regioselective access to amide in the Pd-catalyzed reductive aminocarbonylation of olefin with nitroarene
作者:Li Yang、Lijun Shi、Chungu Xia、Fuwei Li
DOI:10.1016/s1872-2067(20)63561-6
日期:2020.7
reductive aminocarbonylation of olefins with nitroarenes was developed using carbon monoxide (CO) as both reductant and carbonyl source, which enables facile access to amides with excellent regioselectivity and broad substrate scope. It is found that the counter anions of the Pd catalyst precursors significantly affect the reaction chemoselectivity and amide regioselectivity. Branched amides were mainly
摘要 以一氧化碳 (CO) 作为还原剂和羰基源,开发了一种钯催化烯烃与硝基芳烃还原氨基羰基化的有效途径,该途径可以轻松获得具有优异区域选择性和广泛底物范围的酰胺。发现Pd催化剂前体的抗衡阴离子显着影响反应化学选择性和酰胺区域选择性。支链酰胺主要以K2PdCl4为金属催化剂得到,膦配体对区域选择性没有影响,但影响催化反应活性。然而,当使用 Pd(CH3CN)4(OTf)2 时,膦配体对氨基羰基化区域选择性有显着影响;单齿膦倾向于形成支链酰胺,而双齿膦主要形成线性酰胺。从硝基芳烃还原的所有可能的 N 物种的捕获实验、初级动力学研究和控制反应表明,支链和线性酰胺的催化合成分别产生了氮烯(进一步转化为烯酰胺)和苯胺,这与之前的配体控制的区域选择性不同通过烯烃与胺的氨基羰基化合成酰胺。此外,所提出的合成路线可用于在温和条件下合成克级丙腈。与以前通过烯烃与胺的氨基羰基化合成酰胺的配体控制的区域选择性不
A Practical and General Amidation Method from Isocyanates Enabled by Flow Technology
作者:Jason D. Williams、William J. Kerr、Stuart G. Leach、David M. Lindsay
DOI:10.1002/anie.201807393
日期:2018.9.10
The addition of carbonnucleophiles to isocyanates represents a conceptually flexible and efficient approach to the preparation of amides. This general synthetic strategy has, however, been relatively underutilized owing to narrow substrate tolerance and the requirement for less favourable reaction conditions. Herein, we disclose a high‐yielding, mass‐efficient, and scalable method with appreciable
Enantioselective β-C(sp<sup>3</sup>)–H arylation of amides<i>via</i>synergistic nickel and photoredox catalysis
作者:Wu Zhang、Xiaomin Shu、Leitao Huan、Buqing Cheng、Haohua Huo
DOI:10.1039/d1ob01774h
日期:——
An enantioselective benzylic β-C(sp3)–Harylation of amides via synergistic nickel and photoredoxcatalysis is reported. The C–H bond is activated by a bromine-radical-mediated C–H cleavage. This mild yet straightforward protocol provides arylation products in up to 96% yield and with up to 95% ee.
Synthesis and biological evaluation of a class of 5-benzylidene-2-phenyl-thiazolinones as potent 5-lipoxygenase inhibitors
作者:Sebastian Barzen、Carmen B. Rödl、Andreas Lill、Dieter Steinhilber、Holger Stark、Bettina Hofmann
DOI:10.1016/j.bmc.2012.04.003
日期:2012.6
A class of 5-lipoxygenase (5-LO) inhibitors characterized by a central 5-benzylidene-2-phenyl-thiazolinone scaffold was synthesized as a new series of molecular modifications and extensions of a previously reported series. Compounds were tested in a cell-based and a cell-free assay and furthermore evaluated for their influence on cell viability. The presented substituted thiazolinone scaffold turned out to be essential for both the 5-LO inhibitory activity and the non-cytotoxic profile. With (Z)-5-(4-methoxybenzylidene)-2-(naphthalen-2-yl)-5H-thiazol-4-one (2k, ST1237), a potent, direct, non-cytotoxic 5-LO inhibitor with IC50 of 0.08 mu M and 0.12 mu M (cell-free assay and intact cells), we present a promising lead optimization and development for further investigations as novel anti-inflammatory drug. (C) 2012 Elsevier Ltd. All rights reserved.