Enantioselective 1,4‐Addition Reaction of α,β‐Unsaturated Carboxylic Acids with Cycloalkanones Using Cooperative Chiral Amine–Boronic Acid Catalysts
作者:Takahiro Horibe、Takashi Hazeyama、Yuto Nakata、Kazuki Takeda、Kazuaki Ishihara
DOI:10.1002/anie.202007639
日期:2020.9.21
An enantioselective 1,4‐addition of α,β‐unsaturated carboxylic acids with cycloalkanones has been developed by using chiral amine–boronic acid cooperative catalysts. In the presence of a chiral amine and boronic acid, cycloalkanones and carboxylic acids are activated as chiral enamines and mixed anhydrides, respectively. The corresponding 1,4‐adducts are obtained in high yield with high enantioselectivity
通过使用手性胺-硼酸协同催化剂,已经开发出了α,β-不饱和羧酸与环烷酮的对映选择性1,4加成反应。在手性胺和硼酸的存在下,环烷酮和羧酸分别被活化为手性烯胺和混合酸酐。相应的1,4加合物以高收率和高对映选择性获得。此外,随后的1,4加合物的氧化内酯化作用使螺内酯具有非对映选择性高。