Gold- or Platinum-Catalyzed Cascade Processes of Alkynol Derivatives Involving Hydroalkoxylation Reactions Followed by Prins-Type Cyclizations
作者:José Barluenga、Amadeo Fernández、Alejandro Diéguez、Félix Rodríguez、Francisco J. Fañanás
DOI:10.1002/chem.200900856
日期:2009.11.2
efficient method for the synthesis of [3.3.1]bicyclic compounds from easily available alkynol derivatives has been developed. The reaction is based on a gold‐ or platinum‐catalyzed tandem process that involves an intramolecular hydroalkoxylation of a triple bond followed by a Prins‐type cyclization. The reaction has been carried out with differently substituted alkynol derivatives and oxygen‐, nitrogen‐
Asymmetric Synthesis of
<i>N</i>
‐Substituted α‐Amino Esters from α‐Ketoesters via Imine Reductase‐Catalyzed Reductive Amination
作者:Peiyuan Yao、James R. Marshall、Zefei Xu、Jesmine Lim、Simon J. Charnock、Dunming Zhu、Nicholas J. Turner
DOI:10.1002/anie.202016589
日期:2021.4.12
N‐Substituted α‐amino esters are widely used as chiral intermediates in a range of pharmaceuticals. Here we report the enantioselective biocatalyic synthesis of N‐substituted α‐amino esters through the direct reductive coupling of α‐ketoesters and amines employing sequence diverse metagenomic imine reductases (IREDs). Both enantiomers of N‐substituted α‐amino esters were obtained with high conversion