Second-Layer Chiral Environment-Induced Steric Hindrance Enables Catalyst Conformation Lockdown in Enantioselective Hypervalent Iodine Organocatalysis
作者:Xiaotao Zhang、Miaomiao Liu、Hao Ge、Zhipeng Zhang
DOI:10.1021/acscatal.3c02018
日期:2023.6.16
A class of confined chiral hypervalent iodines have been designed and developed by incorporating two sterically demanding BINOL-derived units, which form the second-layer chiral environment, into the iodine-containing molecules to lock down the conformation of the catalyst and indirectly create a compact chiral environment around the active site. Good-to-excellent enantioselectivities have been achieved
通过将两个空间要求高的 BINOL 衍生单元(形成第二层手性环境)结合到含碘分子中以锁定催化剂的构象并间接产生致密结构,设计和开发了一类受限手性高价碘活性位点周围的手性环境。这些催化剂在酮的 α-氧磺酰化(高达 97.5:2.5 er)和 5-oxo-5-arylpentanoic 酸氧化环化为 γ-丁内酯(高达 98:2)方面实现了良好至卓越的对映选择性呃),从而证明了这种策略在催化剂设计中的实用性。