我们在之前的通讯中描述了流行的 Cu I催化的叠氮化物-炔烃环加成 (AAC) 过程的变体,其中 5 mol% 的 Cu(OAc) 2在不添加任何还原剂的情况下足以进行反应。发现 2-吡啶甲酰叠氮化物( 1 ) 和 2-叠氮甲基喹啉 ( 2 ) 是迄今为止最具反应性的叠氮化碳底物,在所发现的条件下,它们可在短短几分钟内转化为 1,2,3-三唑。我们假设1和2螯合 Cu II 的能力对观察到的高反应速率有显着贡献。目前的工作检查了在 Cu II 的吡啶基以外的叠氮基附近的辅助配体对 Cu(OAc) 2加速的 AAC 反应效率的影响。在报道的条件下,能够以螯合方式与烷基化叠氮氮的催化铜中心结合的碳叠氮化物确实被证明是优良的底物。在 X 射线单晶结构中证明了叠氮化碳11和 Cu II之间的螯合。在一组有限的例子中,由 Fokin 等人开发的配体三(苄基三唑基甲基)胺(TBTA)。用于辅助原始 Cu
作者:Gui-Chao Kuang、Heather A. Michaels、J. Tyler Simmons、Ronald J. Clark、Lei Zhu
DOI:10.1021/jo101305m
日期:2010.10.1
complex of T6 were characterized by X-ray crystallography. The structure of [Cu(T1)2(H2O)2](ClO4)2 reveals the interesting synergistic effect of hydrogenbonding, π−π stacking interactions, and metal coordination in forming a one-dimensional supramolecular construct in the solid state. The tetradentate coordination mode of T6 may be incorporated into designs of new molecule sensors and organometallic
我们在之前的通讯中描述了流行的 Cu I催化的叠氮化物-炔烃环加成 (AAC) 过程的变体,其中 5 mol% 的 Cu(OAc) 2在不添加任何还原剂的情况下足以进行反应。发现 2-吡啶甲酰叠氮化物( 1 ) 和 2-叠氮甲基喹啉 ( 2 ) 是迄今为止最具反应性的叠氮化碳底物,在所发现的条件下,它们可在短短几分钟内转化为 1,2,3-三唑。我们假设1和2螯合 Cu II 的能力对观察到的高反应速率有显着贡献。目前的工作检查了在 Cu II 的吡啶基以外的叠氮基附近的辅助配体对 Cu(OAc) 2加速的 AAC 反应效率的影响。在报道的条件下,能够以螯合方式与烷基化叠氮氮的催化铜中心结合的碳叠氮化物确实被证明是优良的底物。在 X 射线单晶结构中证明了叠氮化碳11和 Cu II之间的螯合。在一组有限的例子中,由 Fokin 等人开发的配体三(苄基三唑基甲基)胺(TBTA)。用于辅助原始 Cu
General Cycloaddition Between a Trimethylsilyl-Capped Alkyne and an Azide Catalyzed by an N-Heterocyclic Carbene-Copper Complex and Pyridine-Biscarboxamide
作者:Haochen Xu、Zhihua Sun
DOI:10.1002/adsc.201501171
日期:2016.6.2
With an externally provided catalytic amide facilitator and an N‐heterocyclic carbene‐copper (NHC‐Cu) complex, the cycloaddition of an azide and a trimethylsilyl (TMS)‐capped alkyne can proceed smoothly. This protocol can be applied to a variety of TMS‐capped substrates, with electron‐rich alkynes generally giving higher yields and nitroaromatic alkynes giving lower yields. For special applications
Copper(II)-exchanged hydroxyapatite, prepared by ion-exchanging of Ca(II) in calcium hydroxyapatite [Ca-10(PO4)(6)(OH)(2)] with Cu(NO3)(2) at 70 degrees C in water, functions as a reusable heterogeneous catalyst with neither reducing agents nor bases for azide-alkyne [3+2] cycloaddition at 50 degrees C in water under air. (C) 2011 Elsevier Ltd. All rights reserved.
Rhodium-catalyzed triazole-directed C–H bond functionalization of arenes with diazo compounds
作者:Huanhong Wang、Xiaofei Yi、Yanli Cui、Wanzhi Chen
DOI:10.1039/c8ob01673a
日期:——
science. In this paper, rhodium(III)-catalyzed triazole-directed alkylation reactions of arenes using diazo compounds as the alkylating agents are described. A number of polysubstituted arenes were provided from easily available materials in good yields under mild conditions. The reactions proceed via triazole-directed ortho C–H bond activation and subsequent carbeneinsertion originating from diazo