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
Abstract An efficient palladium-catalyzeddecarboxylative selective C–H acylation is reported using α-oxocarboxylic acids as the acyl source directed by 1,2,3-triazole ring. This method provides a novel access to various 1,2,3-triazole derivatives bearing diaryl ketone skeleton. An efficient palladium-catalyzeddecarboxylative selective C–H acylation is reported using α-oxocarboxylic acids as the acyl source
Magnetically Recoverable CuFe<sub>2</sub>O<sub>4</sub>Nanoparticles: Catalyzed Synthesis of Aryl Azides and 1,4-Diaryl-1,2,3-triazoles from Boronic Acids in Water
Magneticallyrecoverable and reusable CuFe2O4 nanoparticles are shown to be highly efficient catalysts for the one-pot synthesis of biologically important 1,4-diaryl-1,2,3-triazoles starting fromboronicacids, sodium azide, and acetylenes. The use of aqueous reaction medium at room temperature, the low cost and facile recovery of the catalyst by application of an external magnetic field, and consistently
Aqueous bile salt accelerated cascade synthesis of 1,2,3-triazoles from arylboronic acids
作者:Anirban Garg、Abdul Aziz Ali、Krishnaiah Damarla、Arvind Kumar、Diganta Sarma
DOI:10.1016/j.tetlet.2018.09.064
日期:2018.11
A facile, efficient and mild copper catalyzed strategy for cascade synthesis of various 1,4-disubstituted 1,2,3-triazoles from arylboronic acids, sodium azide and alkynes was developed by using aqueous bile salt NaDC solution as an accelerating medium. Low catalyst loading (only 1 mol% Cu source was sufficient for in situ generation of azide followed by azide–alkyne coupling), green solvent, use of
Palladium-catalyzed acetoxylation of arenes by 1,2,3-triazole-directed C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:mtext /></mml:mrow></mml:math>H activation
A facile and efficient method for the regioselective acetoxylation of 1,4-disubstituted 1,2,3-triazoles via Pd-catalyzed CH bond activation was developed. The cheap acetic acid was applied as the acetoxyl source to convert aromatic sp2 CH bonds into CO bonds in high regioselectivity, employing 1,2,3-triazole as an elegant directing group and K2S2O8 as the oxidant. A range of 1,2,3-triazoles bearing
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。