19744-83-3Relevant articles and documents
Bronsted acidic ionic liquids promoted cyclocondensation reaction: Synthesis of 1,8-dioxo-octahydroxanthene
Salvi,Mandhare,Sartape,Pawar,Han,Kolekar
, p. 883 - 886 (2011)
Novel Bronsted acidic ionic liquids bearing hydrogen sulfate and dihydrogen phosphate as anions were designed and successfully applied as catalysts for the one-pot synthesis of 1,8-dioxo-octahydroxanthene in water medium. The sequence of the catalytic act
Microwave assisted synthesis and crystal structure of 3,3,6,6-tetramethyl- 9-(phenyl)-1,8-dioxo-2,3,4,5,6,7-hexahydroxanthene
Rao, Xiao-Ping,Wu, Yong,Song, Zhan-Qian,Shang, Shi-Bin
, p. 500 - 503 (2009)
The title compound (C23H26O3, M r = 350.44) has been synthesized under microwave irradiation. Its structure was characterized by IR, 1H NMR spectroscopy and single-crystal X-ray diffraction. The title
Diversity Oriented Synthesis of Polycyclic Heterocycles through the Condensation of 2-Amino[1,2,4]triazolo[1,5-a]pyrimidines with 1,3-Diketones
Pyatakov, Dmitry A.,Sokolov, Andrey N.,Astakhov, Alexander V.,Chernenko, Andrey Yu.,Fakhrutdinov, Artem N.,Rybakov, Victor B.,Chernyshev, Vladimir V.,Chernyshev, Victor M.
, p. 10694 - 10709 (2015)
The acid-catalyzed condensation between 2-aminosubstituted [1,2,4]triazolo[1,5-a]pyrimidines and their analogues with various saturation of the pyrimidine ring and 1,3-diketones or 1,1,3,3-tetramethoxypropane was evaluated as a new approach for the synthesis of diversely substituted polycyclic derivatives of triazolopyrimidine. The reaction of 4,5,6,7-tetrahydro- or aromatic aminotriazolopyrimidines results in selective formation of the corresponding [1,2,4]triazolo[1,5-a:4,3-a′]dipyrimidin-5-ium salts, and the condensation of substrates containing the 4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine fragment is accompanied by a cascade rearrangement with unusual recyclization of the dihydropyrimidine ring to yield partially hydrogenated [1,2,4]triazolo[1,5-a:4,3-a′]dipyrimidin-5-ium or pyrimido[1′,2′:1,5][1,2,4]triazolo[3,4-b]quinazolin-5-ium salts. The proposed methodology exhibits a wide scope, providing rapid access to polycondensed derivatives of the [1,2,4]triazolo[1,5-a]pyrimidine scaffold. DFT calculations of the Gibbs free energies of possible isomers were performed to rationalize the experimentally observed reactivity and selectivity.
Efficient and clean synthesis of 1,8-dioxooctahydroxanthenes in aqueous medium
Pore, Santosh B
, p. 2621 - 2624 (2018)
In this work, an efficient synthesis of 1,8-dioxooctahydroxanthenes in aqueous medium is reported. The reaction was catalyzed by aqueous extract of plant material (pericarp of Sapindus trifoliatus fruit), which makes this protocol 'green' and eco-friendly
Iron (III)-catalyzed one-pot synthesis of fused 4H-pyran derivatives via Knoevenagel-Michael-cyclization reaction
Yang, Hongchen,Xiong, Dongdong,Peng, Yanqing,Shao, Xusheng,Xu, Xiaoyong,Li, Zhong
, p. 789 - 799 (2022/01/20)
A facile and efficient protocol has been developed for the synthesis of fused 4H-pyran derivatives via one-pot three components combination of aldehydes, 1,1-bis(methylthio)-2-nitroethylene (BMTNE), and enolketone/dimedone derivatives under the catalysis of FeCl3. The target products could be obtained in moderate to good yields.
Fabrication of activated carbon sulfuric acid as an excellent and novel solid acid catalyst, evaluating its catalytic activity in synthesizing 1,8-dioxo-octahydroxanthenes and 14-aryl-14H-dibenzo[a,j]xanthenes
Marandi, Alireza,Koukabi, Nadiya,Zolfigol, Mohammad Ali
, p. 3145 - 3163 (2021/05/03)
In this work, for the first time, a novel and innovative procedure has been utilized to chemically functionalize activated carbon (AC) based on the sulfonation reaction, which can be used in catalytic reactions as a strong solid acid. For this aim, AC mus
