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
An easy-to-prepare, reusable and versatile catalyst consisting of oxidised copper nanoparticles on activated carbon has been fully characterised and found to effectively promote the multicomponent synthesis of 1,2,3-triazoles from organic halides, diazonium salts, and aromatic amines in water at a low copper loading.
An Organocatalytic Azide-Aldehyde [3+2] Cycloaddition: High-Yielding Regioselective Synthesis of 1,4-Disubstituted 1,2,3-Triazoles
作者:Dhevalapally B. Ramachary、Adluri B. Shashank、S. Karthik
DOI:10.1002/anie.201406721
日期:2014.9.22
An organocatalyticazide–aldehyde [3+2] cycloaddition (organo‐click) reaction of a variety of enolizable aldehydes is reported. The organo‐click reaction is characterized by a high rate and regioselectivity, mild reaction conditions, easily available substrates with simple operation, and excellent yields with a broad spectrum of substrates. It constitutes an alternative to the previously known CuAAC
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.