Sequential Au/Cu Catalysis: A Two Catalyst One-Pot Protocol for the Enantioselective Synthesis of Oxazole α-Hydroxy Esters <i>via</i>
Intramolecular Cyclization/Intermolecular Alder-Ene Reaction
作者:Kumara Swamy Nalivela、Matthias Rudolph、Elham S. Baeissa、Basma G. Alhogbi、Ibraheem A. I. Mkhalid、A. Stephen K. Hashmi
DOI:10.1002/adsc.201800246
日期:2018.6.5
alkylglyoxylates 3 was developed. The first step of the one‐pot procedure is the selective intramolecular in situ formation of an alkylideneoxazoline 2, which then in an intermolecular reaction is enantioselectively transformed to the oxazole α‐hydroxy ester derivatives 4 in quantitative yield and good to excellent enantioselectivity via an asymmetric copper(II)‐catalyzed Alder‐enereaction.
Readily switchable one-pot 5-exo-dig cyclization using a palladium catalyst
作者:Jaishree K. Mali、Balaram S. Takale、Vikas. N. Telvekar
DOI:10.1039/c6ra25857c
日期:——
A convenient, ligand-free, Pd(OAc)2-catalyzed one-pot reaction has been developed for the synthesis of oxazolines and oxazoles from easily available acid chlorides and propargylamine. The reaction pathways could be easily modulated to selectively obtain oxazolines or oxazoles by merely changing the additives. This method proceeds via in situ sequential nucleophilic addition/elimination reactions followed