General radical difluoromethylation using difluoroacetic anhydride via photoredox catalysis
作者:Meng He、Yankai Yang、Heng Zhang、Zhipeng Guan、Zhi-Bing Dong、Hong Yi、Aiwen Lei
DOI:10.1007/s11426-023-1937-4
日期:2024.8
CF2H-containing molecules play pivotal roles in diverse fields from medicinal chemistry to materials science. However, the application of existing CF2H reagents as a source of CF2H radical is limited by their reactivity and preparation. Herein, we develop a simple and general visible-light-catalyzed radical difluoromethylation reaction of alkenes, dienes, and heteroaromatics using commercially available
Synthesis of novel amino and acetyl amino-4-methylcoumarins and evaluation of their antioxidant activity
作者:Yogesh K. Tyagi、Ajit Kumar、Hanumantharao G. Raj、Parag Vohra、Garima Gupta、Ranju Kumari、Pankaj Kumar、Rajinder K. Gupta
DOI:10.1016/j.ejmech.2004.09.002
日期:2005.4
The six novel 4-methylcoumarins bearing different functionalities such as amino, hydroxy, N-acetyl, acetoxy and nitro have been synthesized and confirmed on the basis of their spectral data ((1)H-, (13)C-NMR, UV, IR and El mass). They were examined for the first time for their effect on NADPH dependent liver microsomal lipid peroxidation in vitro, and the results were compared with other model 4-methylcoumarin derivatives to establish the structure-activity relationship. Our studies demonstrated that amino group is an effective substitute for the hydroxyl group for antioxidant property and produced a dramatic inhibition of lipid peroxidation. Ortho dihydroxy and ortho hydroxy-amino coumarins were found to possess highest antioxidant and radical scavenging activities. (c) 2005 Elsevier SAS. All rights reserved.
Bergel et al., Journal of the Chemical Society, 1938, p. 1375,1380
作者:Bergel et al.
DOI:——
日期:——
Borsche, Chemische Berichte, 1907, vol. 40, p. 2732
作者:Borsche
DOI:——
日期:——
GAO, ZHEN-HENG;ZHOU, YI-MIN;WANG, PING-BAO, YUTSZI XUASYUEH, 8,(1988) N 5, S. 412-418