Propargylic Amination Enabled the Access to Enantioenriched Acyclic α-Quaternary α-Amino Ketones
作者:Wusheng Guo、Linhong Zuo、Manying Cui、Biwei Yan、Shaofei Ni
DOI:10.1021/jacs.1c03182
日期:2021.5.26
A propargylic amination approach toward chiral acyclic α-quaternary α-aminoketones is described. This Cu-catalyzed procedure could be performed open to air using commercially available amines as nucleophiles. The key to success is the use of rationally designed propargylic cyclic carbonates as substrates, which can generate a Cu-bonded enolate zwitterionic intermediate upon decarboxylation. This protocol
endo‐Rule for gold: A highly endo‐selective gold‐catalyzed cycloisomerization of 1,4‐diynes was developed. By employing electron‐rich phosphines and N‐heterocyclic carbenes as ligands, a number of 1,4‐diynes could be cyclized in a desymmetrizing fashion to form dihydrodioxepines and enantiomerically enriched tetrahydrooxazepines (see scheme).