A convenient CuI/DBU catalyzed one-pot method has been developed for the synthesis of 1,4-disubstituted 1,2,3-triazoles through the coupling of aryl iodides with sodium azide, followed by the intermolecular cyclization between the generated aryl azides and phenylacetaldehyde derivatives or alkynes in DMSO. The established protocol was compatible with a wide scope of substrates in good to excellent
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。
Copper-Mediated Synthesis of 1,2,3-Triazoles from<i>N</i>-Tosylhydrazones and Anilines
NNNifty targets: In a straightforward copper‐mediated synthesis of 1,4‐disubstituted and 1,4,5‐trisubstituted 1,2,3‐triazoles, readily available aniline and N‐tosylhydrazone substrates underwent cyclization through CN and NN bond formation (see scheme; Piv=pivaloyl, Ts=p‐toluenesulfonyl). This method enables the preparation of 1,2,3‐triazoles with high efficiency under mild conditions without the
Copper-catalyzed decarboxylation/cycloaddition cascade of alkynyl carboxylic acids with azide
作者:Jia-Qi Shang、Hong Fu、Yi Li、Tao Yang、Chuanzhu Gao、Ya-Min Li
DOI:10.1016/j.tet.2018.11.054
日期:2019.1
A copper-catalyzed decarboxylation/cycloaddition cascade of alkynyl carboxylicacids with azide has been developed. This reaction exhibits good functional group tolerance and wide substrate scope, provides an efficient way to construct 1,4-disubstituted 1,2,3-triazoles.
An Efficient Copper-Catalyzed One-Pot Synthesis of 1-Aryl-1,2,3-triazoles from Arylboronic Acids in Water under Mild Conditions
作者:Changbo Hao、Changjian Zhou、Jianwei Xie、Jie Zhang、Ping Liu、Bin Dai
DOI:10.1002/cjoc.201500643
日期:2015.11
A convenient method for one‐pot two‐step 1,3‐dipolar cycloadditon reaction of arylboronic acid, sodium azide followed with terminal alkynes in the presence of 2‐pyrrolecarbaldiminato‐Cu(II) complexes catalyst is reported. Various 1‐aryl‐1,2,3‐triazoles were prepared in 63%–97% yields in water at 30°C without any additives and avoiding the isolation of unstable aryl azides.