Substrate‐Controlled Chemo‐/Enantioselective Synthesis of α‐Benzylated Enals and Chiral Cyclopropane‐Fused 2‐Chromanone Derivatives
作者:Huimyoung Byeon、Sunghyeon Ryu、Eun Jeong Yoo、Jung Woon Yang
DOI:10.1002/adsc.202100613
日期:2021.11.23
4-dinitrobenzyl chloride in the presence of a chiral secondary amine as the catalyst and base were developed, to obtain a broad spectrum of α-benzylated enals and enantioenriched cyclopropane-fused chroman-2-one derivatives. The cyclopropane-tethered iminium ion clearly served as a key intermediate in these reactions to trigger stereochemical outcomes, one of which was supported by a control experiment
Novel cinnamaldehyde-based aspirin derivatives for the treatment of colorectal cancer
作者:Shan Lu、Obinna N. Obianom、Yong Ai
DOI:10.1016/j.bmcl.2018.07.032
日期:2018.9
worldwide. Current treatments of CRC involve anti-cancer agents with relatively good efficacy but unselectively target both cancer and non-cancer cells. Thus, there is a need to discover and develop novel CRC therapeutics that have potentanti-cancer effects, but show reduced off-target cell effects. Here, a novel series of cinnamaldehyde-based aspirin derivatives were designed and synthesized. Biological
Cinnamaldehydes inhibit thioredoxin reductase and induce Nrf2: potential candidates for cancer therapy and chemoprevention
作者:Eng-Hui Chew、Amrita A. Nagle、Yaochun Zhang、Silvia Scarmagnani、Puvithira Palaniappan、Tracey D. Bradshaw、Arne Holmgren、Andrew D. Westwell
DOI:10.1016/j.freeradbiomed.2009.10.028
日期:2010.1
Trans-cinnamaldehyde (CA) and its analogs 2-hydroxycinnamaldehyde and 2-benzoyloxycinnamaldehyde have been reported to possess antitumor activity. CA is also a known Nrf2 activator. In this study a series of, ortho-substituted cinnamaldehyde analogs was synthesized and screened for antiproliferative and thioredoxin reductase (TrxR)-inhibitory activities. Whereas CA was weakly cytotoxic and TrxR inhibiting, hydroxy and benzoyloxy substitutions resulted in analogs with enhanced antiproliferative activity paralleling increased potency in TrxR inactivation. A novel analog, 5-fluoro-2-hydroxycinnamaldehyde, was identified as exhibiting the strongest antitumor effect (GI(50) 1.6 mu M in HCT 116 cells) and TrxR inhibition (IC50 7 mu M, 1 h incubation with recombinant TrxR). CA and its 2-hydroxy- and 2-benzoyloxy-substituted analogs possessed dual TrxR-inhibitory and Nrf2-inducing effects, both attributed to an active Michael acceptor pharmacophore. At lethal concentrations. TrxR-inhibitory potencies correlated with the compounds antiproliferative activities. The penultimate C-terminal selenocysteine residue was shown to be a possible target. Conversely, at sublethal concentrations, these agents induced an adaptive antioxidant response through Nrf2-mediated upregulation of phase II enzymes, including TrxR induction. We conclude from the results obtained that TrxR inactivation contributes at least partly to cinnamaldehyde cytotoxicity. These Michael acceptor molecules can potentially be exploited for use in different concentrations in chemotherapeutic and chemopreventive strategies. (C) 2009 Elsevier Inc. All rights reserved.
Substrate-Controlled, One-Pot Synthesis: Access to Chiral Chroman-2-one and Polycyclic Derivatives
作者:Xue-Li Sun、Ying-Han Chen、Dan-Yang Zhu、Yan Zhang、Yan-Kai Liu
DOI:10.1021/acs.orglett.6b00160
日期:2016.2.19
appropriate choice of electrophiles, one-pot, multicomponent, enantioselective domino reactions have been realized which contain a five-step sequence and provide highly efficient access to potentially bioactive chroman-2-one derivatives as a single diastereoisomer with excellent enantioselectivities and in high yields. This new strategy could significantly improve the previous protocol by directly starting
Pd-catalyzed selective oxidation of allyl alcohols to access enones and enals
作者:Ruinan Zhang、Xuan Li、Zhenbo Gao
DOI:10.1016/j.tetlet.2022.153976
日期:2022.8
important in synthesis. Here we report a Pd-catalyzed method to selectively oxidize allylic alcohols to enones and enals at room temperature. 27 compounds, including enones, and enals, have been obtained with moderate to excellent yields. Meanwhile, this approach proceeds well on a preparative scale giving a good yield. This work allows the efficient and selective oxidization of various allylic alcohols