efficient catalytic system, CuSO4·5H2O/1-(4-methoxyphenyl)-3-phenylthiourea, for the copper(I)-catalyzed azide–alkyne cycloaddition reaction (CuAAC) was discovered. In the above catalytic system, substitutedthiourea acts both as a reductant and a ligand. CuSO4·5H2O/1-(4-methoxyphenyl)-3-phenylthiourea is both an economical and efficient catalyst for the CuAAC reaction. In addition, the new catalytic system
发现了一种高效的催化体系CuSO 4 ·5H 2 O / 1-(4-甲氧基苯基)-3-苯基硫脲,用于铜(I)催化的叠氮化物-炔烃环加成反应(CuAAC)。在上述催化体系中,取代的硫脲既充当还原剂又充当配体。CuSO 4 ·5H 2 O / 1-(4-甲氧基苯基)-3-苯基硫脲是CuAAC反应的经济有效的催化剂。此外,新的催化系统具有有利的功能,包括温和的绿色反应条件以及广泛的底物相容性。用CuSO 4 ·5H 2制备了各种具有良好产率的1,4-二取代的1,2,3-三唑O / 1-(4-甲氧基苯基)-3-苯基硫脲在水溶液中的催化体系。
An efficient and recyclable thiourea-supported copper(<scp>i</scp>) chloride catalyst for azide–alkyne cycloaddition reactions
作者:Milan Kr. Barman、Ashish Kumar Sinha、Sharanappa Nembenna
DOI:10.1039/c5gc02545a
日期:——
A reaction between two equivalents of bulky thiourea i.e., 1-3-bis(2,6-dimethylphenyl)thiourea(L) [L = (ArNH)2C=S); (Ar = 2,6-Me2C6H3)}] and CuCl2 or CuCl in THF solvent afforded a bulky thiourea stabilized copper(I) halide...
‘Click’ ligand for ‘click’ chemistry: (1-(4-methoxybenzyl)-1-H-1,2,3-triazol-4-yl)methanol (MBHTM) accelerated copper-catalyzed [3+2] azide–alkyne cycloaddition (CuAAC) at low catalyst loading
作者:Rajesh H. Tale、Venkatesh B. Gopula、Gopal K. Toradmal
DOI:10.1016/j.tetlet.2015.09.010
日期:2015.10
1,2,3-triazol-4-yl)methanol (MBHTM) synthesized itself by ‘click’ chemistry shown to promote the dramatic rate enhancement of copper catalyze azide–alkyne cycloaddition (CuAAC) at lowcatalystloading to give diverse 1,4-disustituted 1,2,3-triazoles in high to excellent yields under mild conditions. Using higher catalyst and ligand loading, excellent and 49% yield of the corresponding 1,2,3 triazole
易于获得,具有成本效益,非常稳定且易于调节的基于1,2,3-三唑的配体,(1-(4-甲氧基苄基)-1 - H -1,2,3-三唑-4-基)甲醇(MBHTM)通过“点击”化学反应自行合成的结果表明,在低催化剂负载量下,铜催化叠氮化物-炔烃环加成反应(CuAAC)的速率大大提高,在温和的条件下,可以高产率或优异产率得到各种1,4-废弃的1,2,3-三唑情况。使用较高的催化剂和配体负载量,分别在不到一个小时和几分钟的时间内即可获得相应的1,2,3三唑产物优异的收率和49%的收率,这表明该反应可用于开发快速“点击”反应协议。
Copper-catalyzed carbon–carbon bond cleavage of primary propargyl alcohols: β-carbon elimination of hemiaminal intermediates
作者:Ye-Won Kang、Yu Jin Cho、Kwang-Youn Ko、Hye-Young Jang
DOI:10.1039/c5cy00783f
日期:——
The copper-catalyzed cleavage of carbon–carbon bonds in primary propargyl alcohols under oxygen was investigated. This process involves the formation and fragmentation of hemiaminals from aldehydes (oxidized alcohols) and amines. This reaction mechanism was supported by the formation of N-formyl amines and GC experimental results.
Synthesis of a heterogeneous Cu(OAc)<sub>2</sub>-anchored SBA-15 catalyst and its application in the CuAAC reaction
作者:Nan Sun、Zhongqi Yu、Hong Yi、Xiayue Zhu、Liqun Jin、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.1039/c7nj04495j
日期:——
A dinuclear Cu(OAc)2-anchored SBA-15 silica was synthesized, confirmed and showed excellent catalytic activity for the azide–alkyne cycloaddition reaction in water.