Copper-Catalyzed Cascade Reaction of 4-Iodopyrazole Derivatives with Amidines for the Synthesis of Pyrazolo[4,3-d]pyrimidine Derivatives
作者:Maloy Nayak、Neeraj Rastogi、Sanjay Batra
DOI:10.1002/ejoc.201101454
日期:2012.3
An efficient copper-catalyzedcascadereaction of 4-iodopyrazolecarbaldehydes and 4-iodopyrazolecarboxamides with substituted amidines for the preparation of substituted pyrazolo[4,3-d]pyrimidines and pyrazolo[4,3-d]pyrimidin-7(6H)-ones, respectively, is described.
First Copper-Catalyzed Intramolecular Amidation in Substituted 4-Iodopyrazoles Leading to the Synthesis of Pyrazolo[4,3-<i>b</i>]- pyridin-5-ones
作者:Somnath Nag、Maloy Nayak、Sanjay Batra
DOI:10.1002/adsc.200900438
日期:2009.11
An unprecedented copper-catalyzedintramolecularamidation of substituted 4-iodopyrazoles generated either via Baylis–Hillman or Horner–Wadsworth–Emmons chemistry for the synthesis of pyrazolo[4,3-b]pyridine-5-ones is described. In addition, the effect of the stereochemistry of the acrylamide on the cross-coupling reaction has been investigated and it is demonstrated that only the Z-isomer is favoured
描述了一种空前的铜催化的取代的4-碘吡唑的分子内酰胺化反应,该反应是通过Baylis-Hillman或Horner-Wadsworth-Emmons化学方法生成的,用于合成吡唑并[4,3 - b ]吡啶-5-酮。另外,已经研究了丙烯酰胺的立体化学对交叉偶联反应的影响,并且表明仅Z-异构体有利于进行分子内环化。
Synthesis of pyrazole-fused polycyclic systems via intramolecular 1,3-dipolar cycloaddition reactions
作者:Maloy Nayak、Neeraj Rastogi、Sanjay Batra
DOI:10.1016/j.tet.2013.03.099
日期:2013.6
Synthesis of a variety of pyrazole-fused systems starting from 4-iodopyrazolecarbaldehydes is described. The general strategy involves Suzuki coupling of 2-formyl aryl boronic acid with the 4-iodopyrazole derivatives generated from either Morita–Baylis–Hillman, Horner–Wadsworth–Emmons or Knoevenagel reactions followed by 1,3-dipolarcycloaddition reaction either by azomethine ylide or nitrile oxide
Copper-Catalyzed Cascade Reactions of Substituted 4-Iodopyrazolecarbaldehydes with 1,2-Phenylenediamines and 2-Aminophenols
作者:Maloy Nayak、Sanjay Batra
DOI:10.1002/adsc.201000662
日期:2010.12.17
A new approach for the synthesis of novel annulated-pyrazoles is presented. This protocol includes an intermolecular condensation followed by a copper-mediated intramolecular CN or CO coupling reaction. The method is applied to a range of substituted 4-iodopyrazolecarbaldehydes which react with 1,2-phenylenediamines or 2-aminophenols to yield substituted 2,4- or 1,4-dihydrobenzo[b]pyrazolo[4,3-e][1
提出了一种合成新型环吡唑的新方法。该方案包括分子间缩合,然后进行铜介导的分子内CN或CO偶联反应。该方法适用于一系列取代的4-碘吡唑甲醛,它们与1,2-苯二胺或2-氨基苯酚反应生成取代的2,4-或1,4-二氢苯并[ b ]吡唑并[4,3- e ] [1 ,4]二氮杂卓或取代的2 H-或1 H-苯并[ b ]吡唑并[3,4- f ] [1,4]恶氮杂卓。
Straightforward copper-catalyzed synthesis of pyrrolopyrazoles from halogenated pyrazolecarbaldehydes
作者:Maloy Nayak、Harikrishna Batchu、Sanjay Batra
DOI:10.1016/j.tetlet.2012.05.148
日期:2012.8
Straightforward synthesis of a variety of pyrrolo-fused pyrazoles via a cascade reaction between halopyrazolecarbaldehydes and ethylisocyanoacetate in the presence of copper and a base is described. (C) 2012 Elsevier Ltd. All rights reserved.