Attack on fluorinated 2-aryloxazolines by organolithiums: dearomatisation, lithiation or substitution
摘要:
Treatment of 4-, 3- or 2-aryl-4,5-diphenyloxazolines with isopropyllithium gives the products of dearomatising addition, fluorine-directed lithiation or nucleophilic aromatic substitution of fluoride depending on substitution pattern and conditions. In the case of the 4-fluoroaryl substrates, fluorinated 1,4-cyclohexadiene may be obtained in good yield. (C) 2011 Elsevier Ltd. All rights reserved.
A one-pot procedure for the synthesis of oxazolines was developed. An amino alcohol was coupled with benzoyl chlorides in the presence of triethylamine to produce a β-hydroxyamide. Direct treatment with methanesulfonyl chloride forms oxazolines in good yields.
Catalytic, Enantioselective <i>Syn</i>-Oxyamination of Alkenes
作者:Emily M. Mumford、Brett N. Hemric、Scott E. Denmark
DOI:10.1021/jacs.1c06750
日期:2021.8.25
2-oxyamination of alkenes using selenium(II/IV) catalysis with a chiral diselenide catalyst is reported. This method uses N-tosylamides to generate oxazoline products that are useful both as protected 1,2-amino alcohol motifs and as chiral ligands. The reaction proceeds in good yields with excellent enantio- and diastereoselectivity for a variety of alkenes and pendant functional groups such as sulfonamides
Attack on fluorinated 2-aryloxazolines by organolithiums: dearomatisation, lithiation or substitution
作者:James Clayton、Jonathan Clayden
DOI:10.1016/j.tetlet.2011.02.091
日期:2011.5
Treatment of 4-, 3- or 2-aryl-4,5-diphenyloxazolines with isopropyllithium gives the products of dearomatising addition, fluorine-directed lithiation or nucleophilic aromatic substitution of fluoride depending on substitution pattern and conditions. In the case of the 4-fluoroaryl substrates, fluorinated 1,4-cyclohexadiene may be obtained in good yield. (C) 2011 Elsevier Ltd. All rights reserved.