对映选择性环收缩反应尚未被广泛报道。我们开发了 5,6-dihydro-2 H -benzo [ b ][1,4]oxazocines 的对映选择性环收缩,提供对映体富集的 3,4-dihydro-2 H -1,4-benzoxazine衍生物作为单一区域异构体。为了获得具有良好产率和对映体比率(高达 93% 产率,98:2 er)的产品,酸性添加剂是必需的。该反应成功地进行了克级反应,产物易于衍生化。
Chiral Alkyl Amine Synthesis via Catalytic Enantioselective Hydroalkylation of Enecarbamates
作者:Deyun Qian、Srikrishna Bera、Xile Hu
DOI:10.1021/jacs.0c11630
日期:2021.2.3
Chiral alkyl amines are omnipresent as bioactive molecules and synthetic intermediates. The catalytic and enantioselective synthesis of alkyl amines from readily accessible precursors is challenging. Here we develop a nickel-catalyzed hydroalkylation method to assemble a wide range of chiral alkyl amines from enecarbamates (N-Cbz-protected enamines) and alkyl halides with high regio- and enantioselectivity
The factors affecting the palladium-catalyzed synthesis of chiral α-chloromethylene-γ-butyrolactone were investigated. The combined effect of ligand, additive and N-Chlorophthalimide (NCP) is an important factor for the yield and ee value of this reaction. The method has good generalizability.