I2-Catalyzed C–O Bond Formation and Dehydrogenation: Facile Synthesis of Oxazolines and Oxazoles Controlled by Bases
摘要:
A general method for the synthesis of oxazolines and oxazoles was developed through I-2-catalyzed C-O bond formation and dehydrogenation with the same oxidant, TBHP. By simply tuning reaction bases, either oxazolines or oxazoles were selectively produced from beta-acylamino ketones.
Dioxazoles, a new mild nitrene transfer reagent in gold catalysis: highly efficient synthesis of functionalized oxazoles
作者:Ming Chen、Ning Sun、Haoyi Chen、Yuanhong Liu
DOI:10.1039/c6cc02776h
日期:——
A gold-catalyzed regioselective [3+2] cycloaddition of ynamides with 1,4,2-dioxazoles has been developed, which offers a novel approach to highly functionalized oxazoles under mild reaction conditions. 1,4,2-Dioxazole was found to act...
A novel [3 + 2] cycloaddition/oxidative aromatization sequence via visible light-induced photoredox catalysis is disclosed. It provides a general synthetic route to 2,4,5-trisubstituted oxazoles from easily accessible 2H-azirines and aldehydes under mild reaction conditions. The potential of this strategy was further demonstrated by the rapid synthesis of a cyclooxygenase-2 inhibitor as well as the
Copper-catalyzed oxidative cyclization of arylamides and β-diketones: new synthesis of 2,4,5-trisubstituted oxazoles
作者:Yang Bai、Wen Chen、Ya Chen、Huawen Huang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1039/c4ra14394a
日期:——
A novel copper catalyzed approach to oxazoles via enamide intermediates was developed from benzamides and β-diketones. The successive condensation and cyclization reactions afforded various 2,4,5-trisubstituted oxazoles in good yields.
An iodine-mediated oxidative dehydrogenation of β-acylamino ketones has been developed for the synthesis of β-ketoenamides in moderate to good yields. Only Z-isomers are accessed due to the intramolecular H-bonding interaction in the HI-elimination step.
已开发出一种碘介导的 β-酰氨基酮氧化脱氢,用于以中等至良好的产率合成 β-酮烯酰胺。由于 HI 消除步骤中的分子内 H 键相互作用,只能访问 Z 异构体。