A new and easy method for the diastereoselective synthesis of 3-functionalized 2,3-dihydrobenzofuran derivatives from allyl 2-bromoaryl ethers is described. The key step of this transformation involves an intramolecular carbolithiation reaction of allyl 2-lithioaryl ethers. The substituents in both the allyl and the aryl moieties play an important and decisive role in stopping the reaction at the benzofuran
描述了一种从烯丙基2-
溴芳基醚非对映选择性合成3-官能化的
2,3-二氢苯并呋喃衍
生物的新方法。该转化的关键步骤涉及烯丙基2-
锂硫代芳基醚的分子内碳
锂化反应。烯丙基和芳基部分中的取代基在终止在
苯并呋喃处的反应中起着重要的决定性作用,从而避免了γ-消除反应。最后,该方法适合于通过使用(-)-
天冬氨酸作为手性诱导剂来合成对映体富集的化合物。