Access to 3‐(2‐Oxoalkyl)‐azaspiro[4.5]trienones
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Acid‐Triggered Oxidative Cascade Reaction through Alkenyl Peroxide Radical Intermediate
作者:Chang‐Sheng Wang、Thierry Roisnel、Pierre H. Dixneuf、Jean‐François Soulé
DOI:10.1002/adsc.201801203
日期:2019.2
Azaspiro[4.5]trienones bearingketone side chains at the 3‐position are prepared from N‐alkyl‐arylpropiolamides and ketones via oxidative 1,2‐difunctionalization of alkynes. The cascade sequence starts with the generation of alkenyl peroxide intermediates, which are obtained by addition of tert‐butyl hydroperoxide to ketones in presence of a catalytic amount of a strong acid. Then, the ketone radical adds to
(<i>Z</i>)-Selective anti-Markovnikov or Markovnikov thiol–yne-click reactions of an internal alkyne by amide hydrogen bond control
作者:Milan Pramanik、Khokan Choudhuri、Subhayan Chakraborty、Arindam Ghosh、Prasenjit Mal
DOI:10.1039/d0cc00702a
日期:——
Herein, we show exclusive control of stereo and regioselective thiol-yne click (TYC) reactions of internal alkynes via amide hydrogenbondcontrol. By exploiting appropriate hydrogenbonding interactions like N-HS, N-HN and C-HO, either (Z)-selective anti-Markovnikov or Markovnikov products could be obtained for an internal alkyne, exclusively.
A general method has been developed for the selective synthesis of 3-iodoquinolin-2-ones and spiro[4.5]trienes via intramolecular iodocyclization of N-(ortho-substituted aryl)-3-phenylpropiolamides using iodine/cerium(IV) ammonium nitrate reagent under mild reaction conditions. The electronic effect of ortho-substituents (electron-rich and electron-deficient group) triggers the two different reaction pathways resulting to iodocyclized quinolin-2-one and ipso-iodocyclized spiro-type compounds.
2,5-Diarylisothiazolone: novel inhibitors of cytokine-induced cartilage destruction
作者:Stephen W. Wright、Joseph J. Petraitis、Bruce Freimark、John V. Giannaras、Michael A. Pratta、Susan R. Sherk、Jean M. Williams、Ronald L. Magolda、Elizabeth C. Arner
DOI:10.1016/0968-0896(96)00053-3
日期:1996.6
A series of 2,5-diarylisothiazolones is reported that inhibit the IL-lp-induced breakdown of bovine nasal septum cartilage in an organ culture assay. The synthesis and preliminary SAR of these compounds are described. These compounds represent a novel, nonpeptide lead series approach to the mediation of the chronic cartilage breakdown associated with arthritic disease. These compounds are relatively resistant to reductive metabolism by liver microsomal preparations and appear to inhibit cartilage breakdown by interfering with the proteolytic activation of matrix metalloproteinases. Copyright (C) 1996 Elsevier Science Ltd
Copper-Catalyzed Domino Synthesis of Benzo[4,5]imidazo[1,2-<i>a</i>]pyrimidin-4(10<i>H</i>)-ones using Cyanamide as a Building Block
作者:Zhenbang Lou、Xudong Wu、Haijun Yang、Changjin Zhu、Hua Fu
DOI:10.1002/adsc.201500577
日期:2015.12.14
An efficient and practical copper-catalyzeddominosynthesis of benzo[4,5]imidazo[1,2-a]pyrimidin-4(10H)-ones has been developed. The protocol uses N-(2-halophenyl)-3-alkylpropiolamides and cyanamide as the starting materials, inexpensive copper(I) iodide and pipecolinic acid as the catalyst and ligand, and the corresponding products were obtained in moderate to good yields.
开发了一种高效实用的苯并[4,5]咪唑并[1,2 - a ]嘧啶-4(10 H)-酮的铜催化多米诺合成。该方案以N-(2-卤代苯基)-3-烷基丙酰胺和氰酰胺为起始原料,廉价的碘化铜(I)和哌啉酸为催化剂和配体,并以中等至良好的产率获得了相应的产物。