Preparation of isoxazol(in)yl substituted selenides and their further deselenenylation reaction to synthesize 3,5-disubstituted isoxazoles
摘要:
We report a mild 1,3-dipolar cycloaddition protocol for the preparation of 3-aryl-5-phenylselenomethyl isoxazoles and isoxazolines regioselectively. The former was further reacted with LDA and electrophilic substrates followed by selenoxide syn-elimination to afford 3-aryl-5-E-substituted-ethenyl isoxazoles stereoselectively and the latter was subjected to a 'two-step' elimination to afford 3-aryl-5-methyl isoxazoles. (C) 2004 Elsevier Ltd. All rights reserved.
Preparation of isoxazol(in)yl substituted selenides and their further deselenenylation reaction to synthesize 3,5-disubstituted isoxazoles
摘要:
We report a mild 1,3-dipolar cycloaddition protocol for the preparation of 3-aryl-5-phenylselenomethyl isoxazoles and isoxazolines regioselectively. The former was further reacted with LDA and electrophilic substrates followed by selenoxide syn-elimination to afford 3-aryl-5-E-substituted-ethenyl isoxazoles stereoselectively and the latter was subjected to a 'two-step' elimination to afford 3-aryl-5-methyl isoxazoles. (C) 2004 Elsevier Ltd. All rights reserved.
Electrochemical Chalcogenation of
<i>β,γ</i>
‐Unsaturated Amides and Oximes to Corresponding Oxazolines and Isoxazolines
作者:Samrat Mallick、Mrinmay Baidya、Kingshuk Mahanty、Debabrata Maiti、Suman De Sarkar
DOI:10.1002/adsc.201901262
日期:2020.3.4
The current report represents a transition‐metal‐freesynthesis of oxazoline and isoxazoline derivatives by a tandem electro‐oxidative chalcogenation‐cyclization process. Both C−Se and C−S bond‐forming protocols were developed without using any external oxidant and the reaction was performed at roomtemperature, open to the air. Using this methodology, 29 substituted oxazoline and 16 substituted isoxazoline
Synthesis of Isoxazolines by the Electrophilic Chalcogenation of β,γ-Unsaturated Oximes: Fishing Novel Anti-Inflammatory Agents
作者:Eric F. Lopes、Filipe Penteado、Samuel Thurow、Mikaela Pinz、Angelica S. Reis、Ethel A. Wilhelm、Cristiane Luchese、Thiago Barcellos、Bianca Dalberto、Diego Alves、Marcio S. da Silva、Eder J. Lenardão
DOI:10.1021/acs.joc.9b01754
日期:2019.10.4
prepare chalcogen-functionalized isoxazolines. The strategy involves the reaction of β,γ-unsaturated oximes with electrophilic selenium and tellurium species, affording 19 new selenium- and tellurium-containing isoxazolines in good yields after 1 h at room temperature. The method was efficiently extended to the synthesis of 5 new (bis)isoxazoline ditellurides. One of the prepared compounds, 3-phenyl-5