Abstract Reductive lithiation of a distereoisomeric mixture of bicyclic oxazolidines followed by reaction with alkyl halides afforded aminoalcohols in a highly syn -selective fashion. Reductive lithiation occurs with racemization at the benzylic carbon atom; the observed diastereoselectivities are rationalized in terms of a pair of rapidly equilibrating diastereoisomeric organolithium intermediates
摘要 对双环
恶唑烷的非对映异构体混合物进行还原
锂化,然后与卤代烷反应,以高度顺式选择性的方式提供
氨基醇。还原性
锂化发生在苄基碳原子的外消旋化;观察到的非对映选择性根据一对快速平衡的非对映异构
有机锂中间体合理化,其中一个在适当的反应条件下优先反应。