Phenoxide chelated Ir(<scp>iii</scp>) N-heterocyclic carbene complexes: synthesis, characterization, and evaluation of their <i>in vitro</i> anticancer activity
作者:Yujiao Zhang、Shumiao Zhang、Zhenzhen Tian、Juanjuan Li、Zhishan Xu、Shanshan Li、Zhe Liu
DOI:10.1039/c8dt03159b
日期:——
This work demonstrated that the twelve novel half-sandwich IrIII–NHC complexes [(η5-Cpx)Ir(C^O)Cl] were synthesized and explored the mechanism of anticancer action.
Compounds enhancing antitumor activity of other cytotoxic agents
申请人:Pfizer Inc
公开号:US06130217A1
公开(公告)日:2000-10-10
This invention relates to certain heterocyclic compounds and their pharmaceutically acceptable salts, which are useful for sensitizing multidrug-resistant tumor cells to anticancer agents and multidrug resistant forms of malaria, tuberculosis, leishmania and amoebic dysentery to chemotherapeutants. The compounds and their pharmaceutically acceptable salts are also inhibitors of the active drug transport capability of P-glycoprotein which is encoded by the human MDR1 gene, as well as of certain other related ATP-binding-cassette transporters from eukaryotic and prokaryotic organisms (e.g., pfmdr from Plasmodium falciprum, and murine mdr1 and mdr3 gene products).
Enhanced Catalytic Activity of Oxygen-Tethered Ir<sup>III</sup>
NHC Complexes in Aqueous Transfer Hydrogenative Reductive Amination Reactions: Experimental Kinetic and Mechanistic Study
The synthesis and characterization of seven new IrIII complexes containing o‐phenoxide or o‐naphthoxide chelated N‐heterocyclic carbene ligands is reported herein. The crystal structures of six of the complexes have been determined. These complexes efficiently catalyze the transfer hydrogenative reductive amination (RA) of carbonyls and amines in water. Amongst the complexes tested, the introduction
本文报道了七种新的Ir III配合物的合成和表征,这些配合物含有邻苯氧或邻萘氧螯合的N杂环卡宾配体。已经确定了六个配合物的晶体结构。这些络合物有效地催化水中羰基和胺的转移氢化还原胺化(RA)。在经过测试的配合物中,引入了o环烷氧基在咪唑基NHC配体的氮原子上大大提高了催化活性。该催化系统具有广泛的底物范围,可以以优异的产率合成多种胺,并具有高达490(对于酮)和14800(对于醛)的高周转率。已经通过NMR光谱和动力学测量研究了RA与邻芳基氧化物螯合的NHC-Ir III催化剂的反应机理。这些研究表明,转移氢化(TH)受氢化物形成步骤的限制。1 H NMR研究的结果表明,邻萘环氧化物螯合催化剂(3 g)的催化活性高于邻苯氧酚被螯合的一(3 b)可以部分归因于氢化铱的快速形成,而氢化铱是RA反应中的关键中间体。
NHC Core Phosphonium Ylide-based Palladium(II) Pincer Complexes: The Second Ylide Extremity Makes the Difference
作者:Rachid Taakili、Cécile Barthes、Amel Goëffon、Christine Lepetit、Carine Duhayon、Dmitry A. Valyaev、Yves Canac
DOI:10.1021/acs.inorgchem.0c00561
日期:2020.5.18
complexes based on phosphonium ylides were easily obtained by acidic treatment of their highly stable ortho-metalated Pd(II) precursors prepared in a single step from readily available N-phosphonio-substituted imidazolium salts. Analysis of IR data indicated that NHC and phenolate ligands have a similar donor character but which remains lower than that of the phosphonium ylide. The impact on catalytic performance
N杂环卡宾(NHC)(A),酚盐(B)和磷鎓内鎓盐(C)部分的配位性能通过制备NHC,磷鎓内鎓盐基钳式配体家族进行了系统地研究末端可以是NHC,酚盐或叶立德。通过比较分子轨道(能量和形状),氧化电位(Epox)以及IRνCO和νCN拉伸频率,分析了此类配体[NHC(AaBbCc)](a + b + c = 2)的总体供体特征。它们的同构钳位Pd(II)配合物[NHC(AaBbCc)PdL] [OTf](L = NCCH3,CO或CNtBu)。通过对易稳定的N-膦酰基取代的咪唑鎓盐进行一步制备的高度稳定的邻位金属化Pd(II)前体进行酸性处理,即可轻松获得三类基于磷鎓pin的钳形复合物。红外数据分析表明,NHC和酚盐配体具有相似的供体特征,但仍低于叶立德phospho。在钯的钯催化的烯丙基化反应中说明了将第二种强供体的磷鎓叶立德掺入配体结构中对催化性能的影响。
heme enzyme indoleamine2,3-dioxygenase1 (IDO1) plays an essential role in immunity, neuronal function, and aging through catalysis of the rate-limiting step in the kynurenine pathway of tryptophan metabolism. Many IDO1inhibitors with different chemotypes have been developed, mainly targeted for use in anti-cancer immunotherapy. Lead optimization of direct heme iron-binding inhibitors has proven difficult