Short synthesis of hydroxylated thiolane and selenolane rings from mono-benzylated pentitols and aldoses dithioacetals bis-thionocarbonates as bis-electrophilic substrates
作者:Alain Danquigny、Mohamed Aït Amer Meziane、Gilles Demailly、Mohammed Benazza
DOI:10.1016/j.tet.2005.05.008
日期:2005.7
by reaction with diimidazolyl thione (Im2CS) in 1,4-dioxane. These bis-electrophilic adducts react regioselectively with Na2S·9H2O or Se/NaBH4 to lead regioselectively to the corresponding thiolane and selenolane rings in good yields for a short synthesis (47–65%).
1- O-苄基戊糖醇(具有d-阿拉伯糖,d- lyxo,d,l-木糖和d,l-核糖构型)和醛糖二苄基二硫缩醛(具有l-阿拉伯糖,d- lyxo,d-木糖,d-核糖,d -半乳糖,D-葡萄糖和D-甘露配置)通过与二咪唑基硫酮(IM反应中直接和有效地转化为它们的环状二硫代羰基碳酸衍生物(61-73%)2在1,4-二恶烷CS)。这些双亲电子加合物与Na 2 S·9H 2 O或Se / NaBH发生区域选择性反应4可以短区域合成(47–65%),以良好的产率将区域选择性地引入相应的硫杂环戊烷和亚硒烷环。