Merging supramolecular catalysis and aminocatalysis: amino-appended β-cyclodextrins (ACDs) as efficient and recyclable supramolecular catalysts for the synthesis of tetraketones
作者:Yufeng Ren、Bo Yang、Xiali Liao
DOI:10.1039/c6ra01002d
日期:——
β-CD were synthesized and employed in the catalytic synthesis of a series of tetraketones as supramolecular catalysts in water for the first time. Yields of 58–97% were obtained with up to 30 examples of substrate. The catalyst could be recycled easily, while a 92% yield and 84% rate of catalyst recovery could be achieved after 8 cycles of catalyst recycling. Moreover, a catalytic mechanism merging
作者:M. Brito-Arias、G. Ramirez、R. E. Rivas、E. Molins、W. Maniukiewicz
DOI:10.1107/s0108270196008530
日期:1996.11.15
The title compound, C23H26N2O4, consists of a partially hydrogenated acridine moiety with one 2-nitrophenyl substituent on the central ring. The acridine nucleus suffers considerable deviations from planarity. The central ring is in a distorted boat conformation, while the two outer rings adopt almost ideal envelope conformations. The phenyl ring of the 2-nitrophenyl substituent is perpendicular to the acridine ring system. Molecules are held together by C-H ... O hydrogen bonds.
Application of
$$\hbox {SiO}_{{2}}$$
SiO
2
nanoparticles as an efficient catalyst to develop syntheses of perimidines and tetraketones
SiO}_2}}\) nanoparticles (NPs) as an eco-friendly, efficient and reusable catalyst in the synthesis of 2,3-dihydro-1H-perimidines as well as tetraketones. For tetraketones syntheses, a simple tandem Knoevenagel condensation following Michael addition procedure is performed by the reaction between benzaldehydes and 5,5-dimethyl-1,3-cyclohexanediones under solvent-free condition using \(\hbox SiO}_2}}\)
Facile and Simple Route to the Synthesis of Condensed Acridine Systems
作者:Periyasamy Murugan、Kuo Chu Hwang、Dhakshanamurthy Thirumalai、Vayalakavoor T. Ramakrishnan
DOI:10.1081/scc-200063947
日期:2005.7
acetate/acetic anhydride furnished the corresponding acridinedione/xanthene derivatives. The middle ring aromatization followed by reductive cyclization afforded the respective condensed acridine systems.