Copper-Catalyzed Synthesis of Purine-Fused Polycyclics
摘要:
A novel protocol for a Cu-catalyzed direct C-(sp2)-H activation/intramolecular amination reaction of 6-anilinopurine nucleosides has been developed. This approach provides a new access to a variety of multiheterocyclic compounds from purine compounds via Cu-catalyzed intramolecular N-H bond tautomerism which are endowed with fluorescence.
Palladium-catalysed ortho-acylation of 6-anilinopurines/purine nucleosides via C–H activation
作者:Srinivasarao Allu、K. C. Kumara Swamy
DOI:10.1039/c5ra18447a
日期:——
Purinyl N1-directed ortho-acylation of 6-anilinopurines was achieved in the presence of [Pd]-catalyst using aldehydes/α-oxocarboxylic acids as the acylating sources.
Palladium-Catalyzed Amination of Aryl Sulfides and Sulfoxides with Azaarylamines of Poor Nucleophilicity
作者:Ramendra Pratap、Hideki Yorimitsu
DOI:10.1055/s-0037-1611732
日期:2019.7
leaving arenethiolate or arenesulfenate anions, instead of aryl methyl sulfides as reported previously. The amination of arylsulfides and sulfoxides with azaarylamines is investigated using a palladium-N-heterocyclic carbene (NHC) complex. Because azaarylamines are less nucleophilic than anilines, more reactive diaryl sulfides and sulfoxides are found to be suitable coupling partners that liberate better
Rhodium(III)-Catalysed Carbenoid C(sp<sup>2</sup>)-H Functionalisation of Aniline Substrates with α-Diazo Esters: Formation of Oxindoles and Characterisation/Utility of an Intermediate-Like Rhodacycle
作者:Srinivasarao Allu、Manjula Ravi、K. C. Kumara Swamy
DOI:10.1002/ejoc.201600968
日期:2016.12
An efficient RhIII-catalysed reaction of 2-anilinopyridines with sulfonylated α-diazo esters under mild conditions gave oxindole derivatives, while an analogous reaction of anilinopyrimidine precursors using α-diazo esters led to the ortho-alkylation products. The carbenoid coupling reaction was successfully extended to 6-anilinopurine/purine nucleosides, and the ortho-alkylated 6-anilinopurines could
在温和条件下,2-苯胺基吡啶与磺酰化 α-重氮酯的有效 RhIII 催化反应得到羟吲哚衍生物,而使用 α-重氮酯的苯胺基嘧啶前体的类似反应得到邻位烷基化产物。卡宾偶联反应成功地扩展到 6-苯胺嘌呤/嘌呤核苷,并且可以以优异的产率获得邻位烷基化的 6-苯胺嘌呤。Rh-C 键合物种参与的证据来自通过单晶 X 射线晶体学表征中间体类红花环(它也是一种活性催化剂)。
New reactions of allenes, alkynes, ynamides, enynones and isothiocyanates
)(OCH}_2}\hbox CMe}_2}\hbox CH}_2}\hbox O)]}\). In an analogous reaction, with DBU as the base at \(140\;^\circ }}\hbox C}\), isomeric vinylphosphine oxides (Z)-\(\hbox Ph}_2}\hbox P(O)C(Ph)=C(Me)CH}_2}\hbox [C(O)Me]}\) and (E)-\(\hbox Ph}_2}\hbox P(O)C(Ph)=C(Me)CH}_2}\hbox [C(O)Me]}\) were isolated. The E-isomer has been characterized by single crystal X-ray structure determination
Ruthenium-Catalyzed Oxidative Annulation of 6-Anilinopurines with Alkynes<i>via</i>CH Activation: Synthesis of Indole-Substituted Purines/Purine Nucleosides
作者:Srinivasarao Allu、K. C. Kumara Swamy
DOI:10.1002/adsc.201500314
日期:2015.8.24
Indole‐substituted purine nucleobases have been synthesized by Ru‐catalyzed oxidative annulation of 6‐anilinopurines with internal alkynes that involves CHactivation. Unsymmetrical aryl(alkyl)alkynes led to high regioselectivity. The reaction was also successful with nucleosides by delivering unprotected indole‐substituted nucleosides. In the presence of [RuCl2(p‐cymene)]2 and copper(II) acetate