A photoredox-catalyzed radical addition of methylene-2-oxazolines has been developed under visible light irradiation to synthesize monofluorooxazoles with quaternary C–F centers using 2-bromo-2-fluoro-3-oxo-3-phenylpropionates as radical source.
An efficient catalytic asymmetric hetero-ene reaction of 5-methyleneoxazolines with 1,2-dicarbonyl compounds (including α-ketoesters and glyoxal derivatives) was realized using Ni(II)–N,N′-dioxide complexes as the catalysts. It provides a rapid, high yielding (up to 99%) route for the preparation of 2,5-disubstituted oxazole derivatives in a highly enantioenriched form (up to >99% ee) under mild conditions.
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
作者:Xi‐Jia Liu、Chao Zheng、Yi‐Han Yang、Shicheng Jin、Shu‐Li You
DOI:10.1002/anie.201904156
日期:2019.7.29
Described herein is an asymmetric allylic aromatization (AAAr) strategy that employs readily accessible equivalents of benzylic nucleophiles in iridium‐catalyzed allylic substitution reactions with the concomitant formation of aromatic rings by aromatization. The optimized reaction conditions involving a catalyst derived from a commercially available iridium precursor and the Carreira ligand are compatible
Assessing the influence of phosphine substituents on the catalytic properties of self-stabilised digold(<scp>i</scp>) complexes with supporting ferrocene phosphinonitrile ligands
Gold(I) phosphinecomplexes are often used in catalysis, but the role of their auxiliary ligands still remains poorly understood. Thus, building on our previous research, we prepared a series of Au(I) complexes [Au2(μ-R2PfcCN)2][SbF6]2 (fc = ferrocene-1,1′-diyl) to assess the effect of phosphine groups PR2 on the catalyticproperties of these highly catalytically active, dimeric compounds. Catalytic