通过Pd催化的C对1,4-二取代的1,2,3-三唑进行区域选择性乙酰氧基化的简便有效方法开发了H键激活。廉价的乙酸用作乙酰氧基源以转化芳香族sp 2 CH键成C键以1,2,3-三唑为优美的导向基团,以K 2 S 2 O 8为氧化剂,以高区域选择性形成O键。通过该反应可以容易地合成一系列带有乙酰氧基的1,2,3-三唑。
Copper-Catalyzed Decarboxylative Cycloaddition of Propiolic Acids, Azides, and Arylboronic Acids: Construction of Fully Substituted 1,2,3-Triazoles
作者:Xiang-Xiang Wang、Yangchun Xin、Yi Li、Wen-Jin Xia、Bin Zhou、Rui-Rong Ye、Ya-Min Li
DOI:10.1021/acs.joc.9b03285
日期:2020.3.6
A copper-catalyzed decarboxylative cycloaddition of propiolic acids, azides, and arylboronicacids is described. The present reaction provides an efficient and convenient method for the synthesis of various fully substituted 1,2,3-triazoles from readily available starting materials. A possible mechanism is proposed.
Copper-catalyzed <i>in situ</i> oxidative-coupling for one-pot synthesis of 5-aryl-1,4-disubstituted 1,2,3-triazoles under mild conditions
作者:Chao Wang、Qianqian Li、Shilei Wang、Gongming Zhu、Anlian Zhu、Lingjun Li
DOI:10.1039/d1ra06827j
日期:——
A new reaction system with CuCl as catalyst, TEA as base and O2/chloramine-T as oxidant was developed for one-pot in situ oxidative-coupling to synthesize 5-aryl-1,4-disubstituted 1,2,3-triazoles in this paper. A variety of 5-arylated-1,2,3-triazole compounds could be efficiently prepared directly from the readily accessible organic azides, terminal alkynes and arylboronic acids. Advantages of the
Pd-NHC-Catalyzed Direct Arylation of 1,4-Disubstituted 1,2,3-Triazoles with Aryl Halides
作者:Tao He、Min Wang、Pinhua Li、Lei Wang
DOI:10.1002/cjoc.201100275
日期:2012.4
highly efficient method for the synthesis of unsymmetrical multi‐substituted 1,2,3‐triazoles via a direct Pd‐NHC system catalyzed C(5)‐arylation of 1,4‐disubstitutedtriazoles, which are readily accessible via "click" chemistry has been developed. It is important to note that CH bond functionalizations of 1,2,3‐triazoles with a variety of differently substituted aryl iodides and bromides as electrophiles
Palladium-Catalyzed Regioselective C-5 Arylation of 1,2,3-Triazoles with Diaryliodonium Salts
作者:Zhengyin Du、Hua Feng、Fangli Gang、Yang Che、Ying Fu
DOI:10.1055/s-0036-1588815
日期:2017.8
An effective method for C-5 arylation of 1,4-disubstituted 1,2,3-triazoles and C-5 regioselective arylation of 1-substituted 1,2,3-triazoles via sp2 C–H activation with palladium as a catalyst and diaryliodoniumsalts as arylating reagents is described. Various electron-rich and electron-deficient substituents attached to triazoles and diaryliodoniumsalts were tolerable to give the desired products
A Cu/Pd-catalyzed, three-component click reaction of azide, alkyne, and aryl halide has been developed. By using this Cu/Pd transmetalation relay catalysis, a variety of 1,4,5-trisubstituted 1,2,3-triazoles were quickly assembled in one step in high yields with complete regioselectivity, just like assembling Lego bricks. Notably, different from the well-established CuAAC click reactions only working on terminal alkynes, this reaction offers an alternative solution for the problem of the click reaction of internal alkynes.