Cyclization of Propargylic Amides: Mild Access to Oxazole Derivatives
作者:Jan P. Weyrauch、A. Stephen K. Hashmi、Andreas Schuster、Tobias Hengst、Stefanie Schetter、Anna Littmann、Matthias Rudolph、Melissa Hamzic、Jorge Visus、Frank Rominger、Wolfgang Frey、Jan W. Bats
DOI:10.1002/chem.200902472
日期:2010.1.18
the oxazole synthesis were developed and chelate ligands can be obtained. The use of Barluenga’s reagent offers a new and mild access to the synthetically valuable iodoalkylideneoxazoles from propargylicamides, this reagent being superior to other sources of halogens.
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
Erratum to “Zn(OTf)2-catalyzed, microwave-promoted synthesis of 2-substituted 5-methyloxazoles from propargylic amides” [Tetrahedron Lett. 60 (2019) 777–779]