Kinetic Resolution and Dynamic Kinetic Resolution of γ‐Aryl‐Substituted Butenolides via Copper‐Catalyzed 1,4‐Hydroboration
作者:Soyeon Lee、Do Hyun Ryu、Jaesook Yun
DOI:10.1002/adsc.202001353
日期:2021.4.27
Kinetic resolution (KR) and dynamic kinetic resolution (DKR) of γ‐aryl and heteroaryl‐substituted butenolides via CuH‐catalyzed 1,4‐hydroboration using pinacolborane is reported. With a copper‐Ph‐BPE catalyst, selectivity factors were extremely high (s=>400) with regard to the kinetic resolution of β‐methyl‐γ‐phenyl butenolide; DKR was possible in the presence of an amine base (DBU), which facilitated racemization
报道了使用频哪醇硼烷通过CuH催化的1,4-氢硼化反应生成的γ-芳基和杂芳基取代的丁烯内酯的动力学拆分(KR)和动态动力学拆分(DKR)。对于铜-Ph-BPE催化剂,关于β-甲基-γ-苯基丁烯内酯的动力学拆分,选择性因子极高(s => 400);在胺碱(DBU)的存在下进行DKR是可能的,这有助于起始不饱和内酯的外消旋化。该反应可轻松获得高度对映体富集的含有β,γ-取代基的γ-丁内酯(> 99%ee)。