Synthesis and antioxidant activities of 3,5-dialkoxy-4-hydroxycinnamamides
摘要:
A series of 3,5-dialkoxy-4-hydroxycinnamamides 6 and 7 was synthesized, and their antioxidant activity was assessed using the thiobarbituric acid reactive substance (TBARS) assay. Interestingly, cinnamamides with longer alkoxy groups on the C-3 and C-5 positions display enhanced inhibition, and most of the compounds in the series tested exhibit excellent lipid peroxidation inhibitory activities. Some cinamamides bearing hexyloxy or 2,6-di-tert-butyl-4-methyl phenol groups have submicromolar inhibitory activities. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis and antioxidant activities of 3,5-dialkoxy-4-hydroxycinnamamides
摘要:
A series of 3,5-dialkoxy-4-hydroxycinnamamides 6 and 7 was synthesized, and their antioxidant activity was assessed using the thiobarbituric acid reactive substance (TBARS) assay. Interestingly, cinnamamides with longer alkoxy groups on the C-3 and C-5 positions display enhanced inhibition, and most of the compounds in the series tested exhibit excellent lipid peroxidation inhibitory activities. Some cinamamides bearing hexyloxy or 2,6-di-tert-butyl-4-methyl phenol groups have submicromolar inhibitory activities. (c) 2008 Elsevier Ltd. All rights reserved.
Environmentally Friendly and Highly Efficient Co(OAc)<sub>2</sub>-Catalyzed Aerobic Oxidation to Access 2,6-Di-Electron-Donating Group Substituted 4-Hydroxybenzaldehydes
作者:Jian-An Jiang、Jia-Lei Du、Zhong-Nan Zhang、Jiao-Jiao Zhai、Ya-Fei Ji
DOI:10.1080/00397911.2013.813052
日期:2014.5.19
developed for selectively preparing a series of valuable 2,6-dialkyl-, dialkoxyl-, and alkoxylalkyl-substituted 4-hydroxybenzaldehydes from corresponding 4-cresols in good to excellent yields, using a catalytic system of Co(OAc)2 · 4H2O (1.0 mol%)–NaOH (1.0 equiv)–O2 (1.0 atm) in aqueousethyleneglycol (EG/H2O = 20/1, v/v) at 50 °C. Furthermore, a plausible mechanism was proposed for the direct oxyfunctionalization
Cu(OAc)<sub>2</sub>-catalyzed remote benzylic C(sp<sup>3</sup>)–H oxyfunctionalization for CO formation directed by the hindered para-hydroxyl group with ambient air as the terminal oxidant under ligand- and additive-free conditions
作者:Jian-An Jiang、Cheng Chen、Jian-Gang Huang、Hong-Wei Liu、Song Cao、Ya-Fei Ji
DOI:10.1039/c3gc41946k
日期:——
A hindered para-hydroxyl group-directed remotebenzylicC(sp3)–H oxyfunctionalization has been developed for the straightforward transformation of 2,6-disubstituted 4-cresols, 4-alkylphenols, 4-hydroxybenzyl alcohols and 4-hydroxybenzyl alkyl ethers into various aromatic carbonyl compounds. The ligand- and additive-free Cu(OAc)2-catalyzed atmospheric oxidation mediated by ethylene glycol unlocks a