The enantiomeric cyclic, five-membered vic-diolsreacted with (PhS)2/Bu3P in benzeneat 80 °C giving the corresponding bis(phenylsulfanyl) derivatives(42-74%) with complete inversion of configurationat both stereogenic centers. Similar reaction conditions were alsosuccessfully used for the enantiospecific transformation of a singlehydroxy group into the respective enantiomeric thioether function.For other vic-diols the neighboring groupparticipation hampered the stereoselectivity of the double substitution.
对映体环状五元沧二醇与 (PhS)2/Bu3P 在
苯中于 80 °C 发生反应,生成相应的双(
苯硫基)衍
生物(42-74%),两个立体中心的构型完全反转。类似的反应条件也成功地用于将单羟基对映体转化为相应对映体的
硫醚官能团。