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
在 β 位具有潜在甲苯磺酸盐或溴化物离去基团的顺式和反式甲硅烷基环氧乙烷可分别通过用 DIBAL-H 对相应炔烃进行非对映特异性还原和用硅烷进行氢化硅烷化来获得。在与甲硅烷基硫缩醛的阴离子反应中,反应的结果取决于构型:顺式环氧乙烷添加亲核甲硫醇并在 Peterson 烯化中得到顺式乙烯基硫化物单元。相比之下,反式环氧乙烷导致官能化四氢呋喃,在环上和环外 α 位置具有甲硅烷基(甲硫基)取代。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)