Cu-Mediated Expeditious Annulation of Alkyl 3-Aminoacrylates with Aryldiazonium Salts: Access to Alkyl <i>N</i><sup>2</sup>-Aryl 1,2,3-Triazole-carboxylates for Druglike Molecular Synthesis
作者:Hao-Nan Liu、Hao-Qiang Cao、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acs.orglett.0c00006
日期:2020.2.21
Alkyl N-aryl 1,2,3-triazole-carboxylates are important molecules or intermediates in medicinal chemistry, but the synthesis of N2-aryl counterparts remains elusive. Herein, we describe a Cu-mediated annulation reaction of alkyl 3-aminoacrylates with aryldiazonium salts, both of which are readily available substrates. Furthermore, alkyl 2-aminoacrylates are also viable substrates. Diverse alkyl N2-aryl
Oxidative Coupling of Enamines and Disulfides<i>via</i>Tetrabutylammonium Iodide/<i>tert-</i>Butyl Hydroperoxide-Mediated Intermolecular Oxidative C(<i>sp</i><sup><i>2</i></sup>)S Bond Formation Under Transition Metal-Free Conditions
作者:Jiyun Sun、Daisy Zhang-Negrerie、Yunfei Du
DOI:10.1002/adsc.201501099
日期:2016.6.30
compounds with disulfides in the presence of tert‐butyl hydroperoxide and a catalytic amount of tetrabutylammonium iodide conveniently afforded a variety of α‐thioenamine compounds through the intermolecular oxidative C(sp2)S coupling. Incorporating both of the sulfide moieties in the disulfides into the final products under oxidative conditions, this novel approach exhibits the feature of atom efficiency
Tetrasubstituted 1,3-Enynes by Gold-Catalyzed Direct C(sp<sup>2</sup>)–H Alkynylation of Acceptor-Substituted Enamines
作者:Chunyu Han、Xianhai Tian、Huili Zhang、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.1c01486
日期:2021.6.18
A gold-catalyzed synthesis of tetrasubstituted 1,3-enynes fromhypervalent iodine(III) reagents and activated alkenes is reported. This reaction involves an in situ formed alkynyl Au(III) species and a subsequent direct C(sp2)–H functionalization of alkenes, offering 26 enynes in 62–92% yield with excellent functional group tolerance.
Cadogan reductive cyclization of substituted 2-aryl-3-nitropyridines to give δ-carbolines was performed under MoO2Cl2(DMF)2 catalysis with triphenylphosphine as a ligand. A new approach for the synthesis of the alkaloid quindoline based on a Mo(VI)-catalyzed Cadogan reductive cyclization of 2-phenyl-3-nitro-5,6,7,8-tetrahydroquinoline followed by aromatization of the resulting 2,3,4,10-tetrahydro-1H-indolo[3
Synthesis of 4-nitro-γ-carbolines by Graebe–Ullmann reaction
作者:Vladislav Yu. Shuvalov、Alexander N. Shestakov、Lyudmila A. Kulakova、Anna K. Kuratova、Marina A. Vorontsova、Galina P. Sagitullina
DOI:10.1007/s10593-019-02547-w
日期:2019.9
Graebe–Ullmann reaction was used to synthesize 3-aryl(methyl)-1-methyl(cyclopropyl)-4-nitro-5Н-pyrido[4,3-b]indoles containing substituents in the pyridine ring. A new scheme was developed for the synthesis of the starting 1-[6-aryl(methyl)-2-methyl(cyclopropyl)- 3-nitropyridin-4-yl]-1Н-1,2,3-benzotriazoles: 1) ammonolysis of 3-nitroisonicotinic acid ethyl esters, 2) a modified Hofmann reaction of 3-nitroisonicotinamides
利用Graebe-Ullmann反应合成了在吡啶环中含有取代基的3-芳基(甲基)-1-甲基(环丙基)-4-硝基-5--吡啶并[4,3- b ]吲哚。-1 -新方案是为起始1- [3-硝基吡啶-4-基-6-芳基(甲基)-2-甲基(环丙基)]的合成开发Н 1):-1,2,3-苯并三唑3-硝基异烟酸乙酯的氨解反应,2)3-硝基异烟碱酰胺的改良霍夫曼反应,3)裂解(2-芳基-3-硝基吡啶-4-基)氨基甲酸乙酯,4)合成4-氯-3-通过4-氨基-3-硝基吡啶的重氮化反应,然后用氯原子对4-吡啶基重氮盐中的重氮基进行亲核取代,形成硝基吡啶。