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
Reduction of nitro- and nitroso-compounds by tervalent phosphorus reagents. Part XI. A kinetic study of the effects of varying the reagent and the nitro-compound in the conversion of o-nitrobenzylideneamines to 2-substituted indazoles
作者:Margaret-Ann Armour、J. I. G. Cadogan、David S. B. Grace
DOI:10.1039/p29750001185
日期:——
A kinetic study of the effects of varying the phosphorus reagent and substituents in the nitro-compound in the reductivecyclisation of o-nitrobenzylideneamines to 2-substituted indazoles has been made. First-order rate constants vary from 8.2 to 52.2 × 10–5 s–1 for the triethyl phosphite-induced reduction of N-o-nitrobenzylideneanilines [o-NO2C6H4CHNC6H4Y; Y =p-MeO, p-Me, H, p-CI, p-Br, p-CO2Et, p-CN
动力学研究了在邻硝基亚苄基胺还原成2-取代的吲唑的环化反应中改变硝基化合物中磷试剂和取代基的作用。一级速率常数从8.2变化至52.2×10 -5小号-1为的亚磷酸三乙酯诱导的减少ñ - ö -nitrobenzylideneanilines [ ø -NO 2 ç 6 ħ 4 CH NC 6 H ^ 4 ÿ; Y = p -MeO,p -Me,H,p -Cl,p -Br,p -CO 2等等,p -CN。p -NO 2,或ö ] -CI和Ñ -5-氯-2- nitrobenzylideneaniline,并略有不同的5至6×10 -5小号-1为ö -nitrobenzylideneamines [ ø -NO 2 ·C 6 H ^ 4 · CH NR; R = Me中,乙基,丙基我,或卜Ñ ]。这些反应的产物是相应的2-芳基-(芳基= C 6 H 4 Y)和2-烷基-(烷基= R)-吲唑。这
Preparation of Polyfunctional Indazoles and Heteroarylazo Compounds Using Highly Functionalized Zinc Reagents
作者:Benjamin Haag、Zhihua Peng、Paul Knochel
DOI:10.1021/ol901585k
日期:2009.10.1
available 2-chloromethylarylzinc reagents react with functionalized aryldiazoniumtetrafluoroborates providing polyfunctional indazoles. Selective metalations of these 2-aryl-2H-indazoles afford new polycyclic aromatics. The performance of a chemoselective addition of diheteroarylzincs to aryldiazonium salts allows an efficient preparation of new heterocyclic azo compounds.
A general and practical method for the direct C–H amination of 2H-indazoles with a series of amines including aliphatic primary amines, secondary amines, azoles, and sulfoximines via organophotoredox-catalyzed oxidative coupling has been disclosed at room temperature under ambient air conditions. Additionally, this protocol is used for free aminated 2H-indazole synthesis. A mechanistic study revealed
maleimides with 2-arylindazoles via C-H activation have been demonstrated. The reaction affords 3-(2-(2H-indazol-2-yl)phenyl)succinimide and 3-(2-(2H-indazol-2-yl)phenyl)maleimide derivatives in high yields with wide functional group tolerance. A mechanistic study was performed to depict C-H bond cleavage that might be involved in the turnover limiting step.