Configuration-Dependent Ring Opening of Silyloxiranes: Synthesis of Functionalized Alkenes or Tetrahydrofurans
作者:Jens Lange、Ernst Schaumann
DOI:10.1002/ejoc.200900448
日期:2009.9
cis- and trans-Silyloxiranes with a potential tosylate or bromide leaving group in the β position are available by the diastereospecific reduction of the corresponding alkynes with DIBAL-H and hydrosilylation with silanes, respectively. In the reaction with the anion of a silylthioacetal, the outcome of the reaction is configuration dependent: the cis-oxiranes add nucleophilic methanthiolate and give