Ultrasound promoted mild and facile one-pot, three component synthesis of 2H-indazoles by consecutive condensation, C N and N N bond formations catalysed by copper-doped silica cuprous sulphate (CDSCS) as an efficient heterogeneous nano-catalyst
作者:Mohammad Navid Soltani Rad
DOI:10.1016/j.ultsonch.2016.07.026
日期:2017.1
An ultrasonic promoted facile and convenient one-pot three-component procedure for the synthesis of 2H-indazole derivatives using copper-doped silica cuprous sulphate (CDSCS) as a heterogeneous nano-catalyst has been described. In this approach, ultrasonic mediated reaction of different substituted 2-bromobenzaldehydes, structurally diverse primary amines, and tetrabutylammonium azide (TBAA) as an
A novel series of bis Indy-NHC gold complexes have been developed and investigated via a mild Ag-carbene transfer route. The obtained complexes were characterized by NMR spectroscopy and X-ray diffraction analysis. The catalytic property of these gold complexes was further evaluated in the oxidation of benzylic. The gold complex E1 showed a high catalytic activity in the oxidation of various benzylic
Access to 2-substituted-2<i>H</i>-indazoles<i>via</i>a copper-catalyzed regioselective cross-coupling reaction
作者:Rong Zhang、Zheng Liu、Qiujun Peng、Yijun Zhou、Lanting Xu、Xianhua Pan
DOI:10.1039/c8ob00128f
日期:——
cross-coupling reaction using commercially available 1H-indazoles with diaryliodonium salts is described. The methodology features ample structural versatility, affording 2-substituted-2H-indazole in good yields and complete N(2)-regiocontrol. Furthermore, the utility of the reaction was demonstrated in the synthesis of a known estrogen receptor β agonist. Mechanistic studies using density functional
Consecutive Condensation, C–N and N–N Bond Formations: A Copper- Catalyzed One-Pot Three-Component Synthesis of 2<i>H</i>-Indazole
作者:Manian Rajesh Kumar、Ahbyeol Park、Namjin Park、Sunwoo Lee
DOI:10.1021/ol201409j
日期:2011.7.1
2H-Indazoles are synthesized using copper-catalyzed, one-pot, three-component reactions of 2-bromobenzaldehydes, primary amines, and sodium azide. A copper catalyst plays the key role in the formation of C-N and N-N bonds. This method has a broad substrate scope with a high tolerance for a variety of functional groups.
Microwave-Assisted Molybdenum-Catalyzed Reductive Cyclization of o-Nitrobenzylidene Amines to 2-Aryl-2H-indazoles
The reductive cyclization of o-nitrobenzylidene amines under microwave conditions employing MoO2Cl2(dmf)(2) as catalyst and Ph3P as reducing agent delivers 2-aryl-2H-indazoles with yields ranging from 61-92%.