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.
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
Tungsten and molybdenum catalyst-mediated cyclisation of N-propargyl amides
作者:Xiangjian Meng、Sunggak Kim
DOI:10.1039/c1ob05512g
日期:——
Tungsten and molybdenum catalysts were employed to promote the cyclisation of N-propargylic amides to afford the corresponding oxazolines or oxazines via 5-exo-dig or 6-endo-dig mode.
Synthesis and characterization of a gold(<scp>i</scp>) bis(triazolylidene) complex featuring a large [(Tp<sup>Me2</sup>)<sub>2</sub>K] anion
作者:Armando Priante-Flores、Verónica Salazar-Pereda、Arnold L. Rheingold、Daniel Mendoza-Espinosa
DOI:10.1039/c8nj03318h
日期:——
heteroleptic gold(I) complexescontaining triazolylidenes (MIC) and TpMe2 ligands, we discovered that reaction of the MIC–Au–I complex2 with potassium hydrotris-(3,5-dimethyl-1-pyrazolil) borate (KTpMe2) produces an unexpected bis(triazolylidene) gold(I) complex featuring a large [(TpMe2)2K] anion (3). An optimized synthesis was achieved by reacting a preformed bis(triazolylidene)Au(I) complex (2a) with
Facile, Selective, and Regiocontrolled Synthesis of Oxazolines and Oxazoles Mediated by ZnI<sub>2</sub> and FeCl<sub>3</sub>
作者:Gopal Chandru Senadi、Wan-Ping Hu、Jia-Shing Hsiao、Jaya Kishore Vandavasi、Chung-Yu Chen、Jeh-Jeng Wang
DOI:10.1021/ol301980g
日期:2012.9.7
An expedient method for a direct approach to the selective and regiocontrolled synthesis of 2-oxazolines and 2-oxazoles mediated by ZnI2 and FeCl3 is described. A Lewis acid promoted cyclization of acetylenic amide with various functionalities was well tolerated to give 2-oxazolines and 2-oxazoles in good to excellent yields under mild reaction conditions.