Synthesis of 3-Iodo Derivatives of Flavones, Thioflavones and Thiochromones
作者:Fang Jie Zhang、Yu Lin Li
DOI:10.1055/s-1993-25904
日期:——
The title compounds, 2-aryl-3-iodo-4H-1-benzopyrans and 2-alkyl-or 2-aryl-3-iodo-4H-1-benzothiopyrans, were prepared by reaction of the corresponding heterocyclic derivatives with the iodine-cerium(IV) ammonium nitrate system under mild conditions. The scope and proposed mechanism of the reaction were also demonstrated.
Synthesis of 2-substituted chromones, chromanones, and their thio analogues using organocopper reagents
作者:Paul D. Clarke、Alan O. Fitton、Hans Suschitzky、Timothy W. Wallace、Hossein A. Dowlatshahi、John L. Suschitzky
DOI:10.1016/s0040-4039(00)83949-0
日期:1986.1
Improved use of organocopperreagents provides a general route to unsymmetrical 2,2-dialkylchomanones and thiochromanones from chromones and thiochromones via a simple addition - oxidation - addition sequence
3-Substituted 2-phenyl-4H-1-benzothiopyran-4-ones (thioflavones) were prepared to test antimicrobial activity. It was found that 3-(phenyl)thiochromone derivatives (isothioflavones) were prepared by the Meerwein reaction of thiochromone with p-nitrobenzenediazonium ion. 3-(Formyl)thioflavone exhibits weak antimicrobial activity against Trichophytons and Candida.
A highly enantioselective access to chiral chromanones and thiochromanones via copper-catalyzed asymmetric conjugated reduction of chromones and thiochromones
作者:Donglu Xiong、Wenxi Zhou、Zhiwu Lu、Suping Zeng、Jun (Joelle) Wang
DOI:10.1039/c7cc03939e
日期:——
chemistry and drug discovery. A highly efficient copper-catalyzed asymmetric conjugated reduction of chromones is developed to give chiral chromanones with good yields (80–99%) and excellent ee values (94–>99% ee). Particularly noteworthy is that chiral thiochromanones are also constructed using this method in 74–87% yields with 96–97% ee. The established asymmetric synthesis paves the way for their
Synthesis and application of near-infrared dyes based on sulfur-substituted dicyanomethylene-4<i>H</i>-chromene and diarylethene
作者:Yuesong Wang、Haoli Yu、Yan Chen、Mengyuan Cui、Min Ji
DOI:10.1039/d2nj02171d
日期:——
Four novel compounds (S-DCM-1O, S-DCM-2O, S-DCM-3O, and S-DCM-4O) based on sulfur-substituted dicyanomethylene-4H-chromene (S-DCM) and diarylethene were synthesized. The detailed investigations on the fluorescence spectra, absorption spectra, and time-dependent density functional theory calculations (DFT/TD-DFT) were presented. The encapsulation of mPEG2000-DSPE effectively increased the solubility