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.
Ultrasound-Promoted Radical Synthesis of 5-Methylselanyl-4,5-dihydroisoxazoles
作者:Daniela R. Araujo、Yanka R. Lima、Angelita M. Barcellos、Márcio S. Silva、Raquel G. Jacob、Eder J. Lenardão、Luana Bagnoli、Claudio Santi、Gelson Perin
DOI:10.1002/ejoc.201901611
日期:2020.2.7
An ultrasound‐promoted method to synthesize 5‐methylselanyl‐4,5‐dihydroisoxazoles through the radical cyclization of unsaturated oximes with diaryl diselenides using Oxone® as an oxidant and ethanol as the solvent is described.
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