Synthesis of Functionalized Thietanes via Electrophilic Carbenoid-Induced Ring Expansion of Thiiranes with Sulfonium Acylmethylides as Carbene Precursors
作者:Jun Dong、Hongguang Du、Jiaxi Xu
DOI:10.1021/acs.joc.9b01152
日期:2019.9.6
Various functionalized thietanes were prepared from thiiranes via an electrophilic ring expansion with rhodium carbenoids as electrophiles generated from safe and readily accessible dimethylsulfonium acylmethylides. The reaction appears to proceed through electrophilic metallocarbenoid-induced activation of thiiranes, nucleophilic ring-opening of the activated thiiranes with dimethyl sulfide as a transient
通过噻吩类化合物通过噻吩类化合物的亲电扩环,从噻吩类化合物制备各种官能化的硫杂环丁烷,所述铑类胡萝卜素是由安全且易于获得的二甲基s酰基甲基化物生成的亲电体。该反应似乎通过亲电性金属类固醇诱导的硫烷的活化,被活化的硫烷的二甲基硫作为瞬时亲核试剂的亲核开环以及亲核的分子内环化而进行。从亲核基团到亲电类胡萝卜素的Umpolung在硫烷的活化和开环以及随后的环化中都起着重要作用。当前的方法提供了一种从容易获得的噻烷有效制备官能化硫杂环丁烷的新策略。