[3 + 2] Cycloaddition of Isocyanides with Aryl Diazonium Salts: Catalyst-Dependent Regioselective Synthesis of 1,3- and 1,5-Disubstituted 1,2,4-Triazoles
作者:Jian-Quan Liu、Xuanyu Shen、Yihan Wang、Xiang-Shan Wang、Xihe Bi
DOI:10.1021/acs.orglett.8b03069
日期:2018.11.2
An unprecedented catalyst-dependent regioselective [3 + 2] cycloaddition of isocyanides with aryl diazonium salts is reported. 1,3-Disubstituted 1,2,4-triazoles were selectively obtained in high yield under Ag(I) catalysis, whereas 1,5-disubstituted 1,2,4-triazoles were formed by Cu(II) catalysis. These catalytic methodologies provide a controlled, modular, and facile access to 1,2,4-triazole scaffolds
Gold(<scp>i</scp>)-catalyzed cross-coupling reactions of aryldiazonium salts with organostannanes
作者:Manjur O. Akram、Popat S. Shinde、Chetan C. Chintawar、Nitin T. Patil
DOI:10.1039/c8ob00630j
日期:——
Gold(I)-catalyzed cross-couplingreactions of aryldiazonium salts with organostannanes are described. This redox neutral strategy offers an efficient approach to diverse biaryls, vinyl arenes and arylacetylenes. Monitoring the reaction with NMR and ESI-MS provided strong evidence for the in situ formation of Ph3PAuIR (R = aryl, vinyl and alkynyl) species which is crucial for the activation of aryldiazonium
描述了金(I)催化的芳基重氮盐与有机锡烷的交叉偶联反应。这种氧化还原中性策略为各种联芳基,乙烯基芳烃和芳基乙炔提供了一种有效的方法。用NMR和ESI-MS监测反应为原位形成Ph 3 PAu I R(R =芳基,乙烯基和炔基)物种提供了有力证据,这对于激活芳基重氮盐至关重要。
Photoinduced, Direct C(sp
<sup>2</sup>
)−H Bond Azo Coupling of Imidazoheteroarenes and Imidazoanilines with Aryl Diazonium Salts Catalyzed by Eosin Y
作者:Sumbal Saba、Caio R. Dos Santos、Bruno R. Zavarise、Aline A. S. Naujorks、Marcelo S. Franco、Alex R. Schneider、Marcos R. Scheide、Ricardo F. Affeldt、Jamal Rafique、Antonio L. Braga
DOI:10.1002/chem.201905308
日期:2020.4.6
Herein, a greener approach to the eosin Y-Na2 catalyzed, C(sp2 )-H bond azo coupling of imidazoheteroarene with aryl diazoniumsalts is described, under acid free conditions. This direct photoredox process resulted in the corresponding azo products in good to excellent yields. Besides, this new approach could also be applicable to anilines, which is a poorly reactive substrate by other methods. The
Intramolecular ipso-arylative cyclization of aryl-alkynoates and N-arylpropiolamides with aryldiazonium salts through merged gold/visible light photoredox catalysis
作者:Avinash H. Bansode、Samir R. Shaikh、Rajesh G. Gonnade、Nitin T. Patil
DOI:10.1039/c7cc04010e
日期:——
A visible-light-promoted merged gold/photoredox catalyzed ipso-arylative cyclization has been reported. For instance, the reaction of aryl-alkynoates and N-arylpropiolamides with aryldiazonium salts in the presence of catalytic amounts of [(4-OCH3)C6H4]3PAuCl and Ru(bpy)3(PF6)2 under irradiation using a 32 W CFL bulb gave arylated spirocarbocycles in moderate to good yields.
可见光促进的合并金/ photoredox催化IPSO -arylative环化的报道。例如,芳基和alkynoates的反应Ñ与芳基重氮盐-arylpropiolamides在催化量的[(4-OCH存在3)C 6 H ^ 4 ] 3 PAuCl和Ru(联吡啶)3(PF 6)2下照射使用32 W CFL灯泡可获得中等至良好收率的芳基化螺碳环化合物。
Aqueous and Visible-Light-Promoted C–H (Hetero)arylation of Uracil Derivatives with Diazoniums
作者:An-Di Liu、Zhao-Li Wang、Li Liu、Liang Cheng
DOI:10.1021/acs.joc.1c01799
日期:2021.12.3
Direct C5 (hetero)arylation of uracil and uridine substrates with (hetero)aryl diazoniumsalts under photoredox catalysis with blue light was reported. The coupling proceeds efficiently with diazoniumsalts and heterocycles in good functional group tolerance at room temperature in aqueous solution without transition-metal components. A plausible radical mechanism has been proposed.