A novel I2-catalyzed direct conversion of cyclohexanones to substituted catechols under mild and simple conditions has been described. This novel transformation is remarkable with the multiple oxygenation and dehydrogenative aromatization processes enabled just by using DMSO as the solvent, oxidant, and oxygen source. This metal-free and simple system demonstrates a versatile protocol for the synthesis
Reaction-activated palladium catalyst for dehydrogenation of substituted cyclohexanones to phenols and H<sub>2</sub> without oxidants and hydrogen acceptors
作者:Jingwu Zhang、Qiangqiang Jiang、Dejun Yang、Xiaomei Zhao、Yanli Dong、Renhua Liu
DOI:10.1039/c5sc01044f
日期:——
A combination of Pd/C and H2 is found to dehydrogenate a wide range of substituted cyclohexanones and 2-cyclohexenones to their corresponding phenols with high isolated yields, with H2 as the only byproduct.
The α-keto methylene group in 3,5-diaryl-2-cyclohexenones 2 and 3,5-diarylcyclohexanones 8 have been used to obtain fused pyrazoles and isoxazoles. The new compounds were characterized by IR and 1H-NMR spectral data.
The reaction of semicarbazones of 3,5-diphenylcyclohex-2-enone 2 and 3,5-diphenylcyclohexanone 8 with seleniumdioxide and thionylchloride resulted in annelated 1,2,3-selena- and thia-diazoles 3, 4, 5, 9 and 10.
Iodine Anion Catalyzed Cross-Dehydrogenative Aromatization for Access to Aromatic Amines
作者:Yan Shi、Cui Yi、Xiaoli Huang、Yuhai Tang、Jiao Jiao、Yang Li
DOI:10.1021/acs.joc.3c00860
日期:2023.7.7
efficient iodine anion catalyzed cross-dehydrogenative aromatization of cyclohexenones with amines has been developed under metal-free conditions, which affords aromatic amines in good to excellent yields with a broad substrate scope. Meanwhile, this reaction provides a new method for the construction of C(sp2)–N bonds and also a new strategy for slow generation of oxidants or electrophiles via in situ