Iodine(III)-Promoted Synthesis of Oxazoles through Oxidative Cyclization of N-Styrylbenzamides
摘要:
The hypervalent iodine reagent PhI(OTf)(2), generated in situ, has been successfully utilized in an intramolecular oxidative cyclization of N-styrylbenzamides. In remarkably short reaction times, the desired 2,5-disubstituted oxazoles were isolated in high yields in this metal-free oxidative C-O bond-forming reaction.
Convenient One-Pot Synthesis of 2,5-Disubstituted Oxazoles via a Catalytic Oxidative Dehydrogenation of F<sub>3</sub>CSO<sub>3</sub>H·SiO<sub>2</sub>-DDQ/CuCl<sub>2</sub>/LiCl
作者:Shizhen Yuan、Zhen Li、Ling Xu
DOI:10.1002/jhet.1637
日期:2013.11
A facile one‐potsynthesis of 2,5‐disubstitutedoxazoles was developed via cyclization of aldoximes and phenylacetylene then dehydrogenation oxidation. 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone was studied for the selective oxidation of oxazolines using Cu2+/Li+ as catalyst and O2 as indirect oxidant. The reaction results showed that this catalyst system can effectively catalyze the oxidation of oxazolines
Copper-catalyzed oxidative cyclization of chalcone and benzylic amine leading to 2,5-diaryl oxazoles via carbon–carbon double bond cleavage
作者:Dongfang Liu、Jintao Yu、Jiang Cheng
DOI:10.1016/j.tet.2013.12.077
日期:2014.2
oxidative cyclization of chalcone with benzylic amine is achieved, providing 2,5-diaryl oxazoles in moderate to good yields. The procedure employs O2 as a clean oxidant and involves an oxidative cleavage of the CC bond as the key step.
A facile type of one-pot, transition-metal-free domino process was developed for the synthesis of oxazoles. Thus, a variety of polysubstituted oxazoles were easily synthesized via t-BuOOH/I2-mediated dominooxidativecyclization from readily available starting materials under mild conditions.
开发了一种简便的单罐,无过渡金属的多米诺骨牌工艺,用于合成恶唑。因此,通过t- BuOOH / I 2介导的多米诺氧化环化反应可以容易地在温和条件下从容易获得的起始原料合成多种多取代的恶唑。
Nickel-Catalyzed Coupling of Azoles with Aromatic Nitriles
作者:Mckenna G. Hanson、Noelle M. Olson、Zubaoyi Yi、Grace Wilson、Dipannita Kalyani
DOI:10.1021/acs.orglett.7b01938
日期:2017.8.18
This manuscript describes the Ni-catalyzed coupling of azoles with aromaticnitriles. The use of BPh3 promotes these arylations with electronically diverse azoles and benzonitriles. While the nickel catalyst is necessary for the arylations of phenyl oxazoles, arylation of benzoxazoles with some nitriles affords the arylated products even in the absence of the Ni catalyst albeit in lower yield than