在可能的金氧化还原催化下,炔烃的立体选择性硫代烯丙基化反应效率高(催化剂负载量低至0.1%,产率高达99%),底物范围广(各种炔烃,分子间和分子内方式)。金(I)催化剂既充当炔烃活化的π-酸,又充当Au I / III偶联的氧化还原催化剂,而原位生成的sulf阳离子则起弱氧化剂的作用。这种新颖的方法为金的氧化还原催化提供了令人兴奋的系统,而无需强氧化剂。
Gold- or Platinum-Catalyzed Synthesis of Sulfur Heterocycles: Access to Sulfur Ylides without Using Sacrificial Functionality
作者:Paul W. Davies、Sébastien J.-C. Albrecht
DOI:10.1002/anie.200904309
日期:2009.10.19
It′s no sacrifice: Alkynes have been used as direct precursors to sulfur ylides under gold or platinum π‐acid catalysis in an atom‐economic manner. An intramolecular redox reaction between an alkyne group with a tethered sulfoxide unit generates a sulfur ylide, which undergoes 2,3‐sigmatropicrearrangement. Acyclic substrates are cycloisomerized to afford functionalized dihydrothiophenones (see scheme)