Dearomatising cyclisation of lithiated allyl phenyl ethers: the role of an oxazoline substituent
摘要:
Treatment of 3-allyloxyphenyl oxazolines with organolithium bases leads to allyllithiums which undergo dearomatising cyclisation. The resulting dearomatised anions may be quenched with electrophiles to form partially saturated benzopyran derivatives. (C) 2013 Elsevier Ltd. All rights reserved.
Dearomatising cyclisation of lithiated allyl phenyl ethers: the role of an oxazoline substituent
摘要:
Treatment of 3-allyloxyphenyl oxazolines with organolithium bases leads to allyllithiums which undergo dearomatising cyclisation. The resulting dearomatised anions may be quenched with electrophiles to form partially saturated benzopyran derivatives. (C) 2013 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.