Indium-Mediated Allylation and Propargylation of Isatins: A Facile Synthesis of 3-Substituted 3-Hydroxyoxindoles
作者:Vijay Nair、Sindu Ros、C. N. Jayan、S. Viji
DOI:10.1055/s-2003-42428
日期:——
Isatins undergo efficient allylation/propargylation when reacted with allyl/propargyl bromide in the presence of indium and sodium iodide to afford the corresponding 3-substituted 3-hydroxyoxindoles.
Applications of Ytterbium(II) Reagent as Grignard Reagent and Single-Electron Transfer Reagent in the Synthesis of 3-Substituted 2-Oxindoles
作者:Songlin Zhang、Pengkai Wang、Xuyan Cao
DOI:10.1055/a-1516-7917
日期:2021.10
The use of ytterbium(II) reagent as both nucleophilic reagent and single-electron transfer reagent in the reaction of isatin derivatives with ytterbium(II) reagent is reported. From a synthetic point of view, a general, efficient, and experimentally simple one-pot method for the preparation of 3-substituted 2-oxindoles was developed.
报道了使用镱 (II) 试剂作为亲核试剂和单电子转移试剂在靛红衍生物与镱 (II) 试剂的反应中。从合成的角度来看,开发了一种通用、高效且实验简单的一锅法制备 3-取代 2-羟吲哚。
Copper(II) Triflate Catalyzed Regioselective and Enantioselective Propargylation of Isatin Derivatives by Using Allenylboronic Acid Pinacol Ester
作者:Naveen Gupta、Rajkumar Tak、Mohd Nazish、Ajay Jakhar、Noor-ul H. Khan、Rukhsana I. Kureshy
DOI:10.1002/ejoc.201701745
日期:2018.3.22
Regioselectivepropargylation of isatins in aqueous media. With this protocol we could achieve propargyl alcohols in high yields with wide substrate scope. The enantioselective version was also explored to yield chiral alcohols with er up to 12:88, which is reported for the first time.
A robust and rapid synthesis of 3-hydroxy-3-alkyl-2-oxindoles from isatins is described. This method introduces an ecofriendly, un-activated Zn dust, solid $$\hbox NH}_4}\hbox Cl}$$ and substrates under aqueous conditions, which has produced the product in moderate to good yields. Without using column chromatography, majority of the compounds were isolated in analytically pure form. The progress of the reaction could be visualized by naked eye. SYNOPSIS A robust and rapid synthesis of 3-hydroxy-3-alkyl-2-oxindoles from isatins is described. This method introduces an ecofriendly method using un-activated Zn dust, solid $$\hbox NH}_4}\hbox Cl}$$ and substrates under aqueous conditions, which has produced the products in moderate to good yields.
Metal-free synthesis of dihydrofuran derivatives as anti-vicinal amino alcohol isosteres
作者:Bhargav Gupta Nangunuri、Rajendra P. Shirke、Mi-hyun Kim
DOI:10.1039/d2ob02077g
日期:——
construct spiro-dihydrofuran and amino dihydrofuran scaffolds as anti-vicinal amino alcohol isosteres. Hypervalent iodine (PhI(OAc)(NTs2))-mediated C–H activation of alkynes resulted in two-bond formations with one pi bond cleavage: (i) C(sp2)–N(sp3) and O(sp3)–C(sp2); (ii) C(sp2)–N(sp3) and C(sp3)–C(sp2). The metal-free 5-endo-dig oxidative cyclization provided versatile amino 2,3- and 2,5-dihydrofurans