Enantioselective Synthesis of β‐Amino Acid Derivatives Enabled by Ligand‐Controlled Reversal of Hydrocupration Regiochemistry
作者:Sheng Guo、Jiaqi Zhu、Stephen L. Buchwald
DOI:10.1002/anie.202007005
日期:2020.11.16
A Cu‐catalyzed enantioselective hydroamination of α,β‐unsaturated carbonyl compounds for the synthesis of β‐amino acid derivatives was achieved through ligand‐controlled reversal of the hydrocupration regioselectivity. While the hydrocupration of α,β‐unsaturated carbonyl compounds to form α‐cuprated species has been extensively investigated, we report herein that, in the presence of an appropriate
铜催化的α,β-不饱和羰基化合物的对映选择性加氢胺化反应合成β-氨基酸衍生物是通过配体控制的氢铜反应区域选择性逆转实现的。虽然已经广泛研究了 α,β-不饱和羰基化合物的氢铜反应形成 α-铜酸盐物质,但我们在本文中报告说,在适当的辅助手性配体存在下,肉桂酸衍生物可以观察到相反的区域化学,导致将铜传递到 β 位。这种铜可以与亲电子胺化试剂 1,2-苯并异恶唑反应,提供富含对映体的 β-氨基酸衍生物,这是合成天然产物和生物活性小分子的重要组成部分。