16197-83-4Relevant articles and documents
Efficient cascade reactions for luminescent pyrylium biolabels catalysed by light rare-earth elements
Wang, Guangming,Li, Xun,Wang, Xuepu,Zhang, Kaka
, p. 12305 - 12310 (2021)
Cascade catalysis allows multiple chemical steps to occur in a well-defined sequential manner without the isolation of reaction intermediates, and has been applied for the efficient preparation of natural products, pharmaceuticals and agrochemicals, with the preparation of organic functional dyes having been rarely explored. In the present study, light rare-earth elements are found to catalyse cascade reactions from simple aromatic substrates and acetic anhydride to give luminescent pyrylium salts with yields up to 50% under mild conditions. The cascade reactions have been coupled to supramolecular assembly to form aqueous pyrylium nanoparticles that can function as protein labels.
Increased conversion to 2,4,6-triarylpyrylium salt: Aldol cyclotrimerization of acetophenone in BMImPF6 ionic liquid
Chuang, Po-Neng,Wu, Tsao-Dong,Liu, Ling-Kang
, p. 512 - 516 (2008)
Substituted acetophenone 1 in BMImPF6 ionic liquid, heated at 120 °C for 24 h, produces β-methylchalcone 2, triarylbenzene 3, and triarylpyrylium salt 4. BMImPF6 catalyzes the self-aldol condensation of 1, whose cyclotrimerization gi
Pd-catalyzed imine-directed intramolecular C–N bond formation through C(sp3)–H activation: An efficient approach to multisubstituted pyrroles
Yu, Ting,Zhu, Qiang,Luo, Shuang
supporting information, (2020/04/08)
An atom-economic approach to synthesize 1,2,4-trisubstituted pyrroles through palladium-catalyzed imine-directed intramolecular C(sp3)–H amination reaction has been developed. The imine group acts as a directing group as well as an intramolecular nucleophile for the first time in intramolecular C–N bonds formation reactions.
Manganese-Catalyzed Aromatic C-H Allylation of Ketones
Ali, Shaukat,Huo, Jiaqi,Wang, Congyang
supporting information, p. 6961 - 6965 (2019/09/30)
Manganese-catalyzed aromatic C-H allylation of ketones is reported. The reaction proceeded in a monoselective allylation manner to provide various ortho C-H allylated ketones in high yields. With challenging allylic electrophiles bearing substituents at t
Synthesis and antimalarial activity of 3,3-spiroanellated 5,6-disubstituted 1,2,4-trioxanes
Maurya, Ranjani,Soni, Awakash,Anand, Devireddy,Ravi, Makthala,Raju, Kanumuri S.R.,Taneja, Isha,Naikade, Niraj K.,Puri,Wahajuddin,Kanojiya, Sanjeev,Yadav, Prem P.
supporting information, p. 165 - 169 (2013/03/29)
Novel 3,3-spiroanellated 5-aryl, 6-arylvinyl-substituted 1,2,4-trioxanes 19-34 have been synthesized and appraised for their antimalarial activity against multidrug-resistant Plasmodium yoelii nigeriensis in Swiss mice by oral route at doses ranging from 96 mg/kg × 4 days to 24 mg/kg × 4 days. The most active compound of the series (compound 25) provided 100% protection at 24 mg/kg × 4 days, and other 1,2,4-trioxanes 22, 26, 27, and 30 also showed promising activity. In this model, β-arteether provided 100 and 20% protection at 48 mg/kg × 4 days and 24 mg/kg × 4 days, respectively, by oral route. Compound 25 displayed a similar in vitro pharmacokinetic profile to that of reference drug β-arteether. The activity results demonstrated the importance of an aryl moiety at the C-5 position on the 1,2,4-trioxane pharmacophore.
Zirconocene bis(perfluorooctanesulfonate) s-catalyzed highly efficient synthesis of 1,3,5-triaryl benzene via cyclotrimerization of ketones
Zhang, Guo Ping,Qiu, Ren Hua,Xu, Xin Hua,Zhou, Hai Hui,Kuang, Ya Fei,Chen, Si Hai
experimental part, p. 858 - 864 (2012/01/19)
Air-stable zirconocene bis(perfluoroctanesulfonate) s [Cp 2Zr]OSO2C8F17) 2] (1) with high Lewis acidity and high thermal stability was prepared by the reaction between Cp2ZrCl2 a
Condensation of ketones in the presence of titanium alkoxides
Yatluk,Sosnovskikh,Suvorov
, p. 763 - 765 (2007/10/03)
Titanium alkoxides promote successful condensation of aromatic and aliphatic ketones provided that the liberated alcohol is selectively removed from the reaction mixture.
Alkylation of α-Halo Diketones via Enol Phosphate Intermediate
Onishi, Jim Yoshitaka,Takuwa, Tomofumi,Mukaiyama, Teruaki
, p. 994 - 995 (2007/10/03)
β-Substituted α,β-unsaturated carbonyl compounds were obtained in moderate to high yields by a 1,4-addition of organocuprates to enol phosphate intermediates formed in situ from triethyl phosphite and 2-bromo-1,3-dicarbonyl compounds.