Chiral Phosphoric Acid-Catalyzed Enantioselective Formal [3+2] Cycloaddition of Azomethine Imines with Enecarbamates
作者:Yang Wang、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201601548
日期:2016.6.6
The first catalytic asymmetric inverse electron demand 1,3‐dipolar cycloaddition of azomethine imines with enecarbamates has been developed. Isoquinoline‐fused pyrazolidines containing two or three contiguous stereogenic centers were obtained in high yields with excellent regio‐, diastereo‐, and enantioselectivities. The pyrazolidine ring can be opened to install an aminal, α‐amino nitrile, or homoallylamine
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
[reaction: see text] Novel Mannich-type reactions of 1,3-dicarbonylcompounds with enecarbamates have been developed. Stable and storable enecarbamates work as surrogates of aliphatic aldehyde-derived imines, which are known to be difficult to isolate and store.