Asymmetric Synthesis of Chiral Dihydrothiopyrans via an Organocatalytic Enantioselective Formal Thio [3 + 3] Cycloaddition Reaction with Binucleophilic Bisketone Thioethers
作者:Shengzheng Wang、Yongqiang Zhang、Guoqiang Dong、Shanchao Wu、Shiping Zhu、Zhenyuan Miao、Jianzhong Yao、Hao Li、Jian Li、Wannian Zhang、Chunquan Sheng、Wei Wang
DOI:10.1021/ol4027705
日期:2013.11
An unprecedented organocatalytic highly enantioselective approach to a 3,4-dihydro-2H-thiopyran scaffold with two contiguous stereogenic centers has been implemented through a formal thio [3 + 3] cycloaddition process involving a Michael–aldol condensation cascade sequence. Notably, a new class of binucleophilic bisketone thioethers is designed for the process. Furthermore, the fine-tuning of their
通过涉及迈克尔-醛醇缩合级联序列的正式硫[3 + 3]环加成过程,已经实现了对具有两个连续立体中心的3,4-二氢-2 H-硫吡喃骨架进行前所未有的有机催化高对映选择性的方法。值得注意的是,为该方法设计了新型的双亲核性双酮硫醚。此外,它们的反应性的微调使得级联过程能够高度区域选择性地进行。