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.