Design, synthesis, in vitro and in vivo evaluation of tacrine–cinnamic acid hybrids as multi-target acetyl- and butyrylcholinesterase inhibitors against Alzheimer's disease
vitro cholinesteraseinhibitoryactivities, inhibition of amyloid β-protein self-aggregation, cyto-protective effects against hydrogen peroxide and antiproliferative activity in PC-12 cells. The optimal compounds 35 and 36 are subsequently selected for in vivo assays. 36 shows much better performance in ameliorating the scopolamine-induced cognition impairment and less hepatotoxicity than tacrine. The
Effect of Substitution on the 2+2 Cycloaddition Reaction of Phenylpropanoids
作者:Wendy R. Russell、A.Bryan Hanley、Mark J. Burkitt、Andrew Chesson
DOI:10.1006/bioo.1999.1143
日期:1999.10
Formation of the cyclobutane products truxillic and truxinic acid within the plant cell wall could occur by photocycloaddition or possibly by enzyme-mediated radical coupling. Model precursors were synthesized and the mode of formation of the cyclobutane products was investigated. Modeling studies suggested that all the model compounds with the exception of the 2-hydroxylated diester contained the correct geometry for photocyclization and this was confirmed by irradiation. Delocalization of the unpaired electron was measured by ESR and the photochemical reaction rates were compared with the partial atomic orbital population of the singly occupied molecular orbital. It was observed that the 3-hydroxylated derivative had almost no delocalization to C8 and the lowest reaction rate. The rate of reaction increased with increasing extent of methoxylation. Incubation with silver oxide or with peroxidase failed to induce intramolecular dimerization. These results suggest that the biological mode of formation of truxillic and truxinic acid is the most likely via light-catalyzed 2+2 cycloaddition. (C) 1999 Academic Press.
Sonn, Chemische Berichte, 1913, vol. 46, p. 4053
作者:Sonn
DOI:——
日期:——
Optical Behaviors of Cholesteric Liquid-Crystalline Polyester Composites with Various Chiral Photochromic Dopants
作者:Chih-Chieh Chien、Jui-Hsiang Liu
DOI:10.1021/acs.langmuir.5b03201
日期:2015.12.15
field of chiral nematic liquid crystals, such as color displays, are now being widely proposed. This article describes the tunable incident reflection band based on composite materials of low-molecular-weight chiroptical dopants and polymeric networks. These materials have advantages including easily manageable color according to a change in the helical pitch of the cholesteric liquid crystal upon exposure