Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 21, Issue 21, Pages 6763-6770Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2013.08.002
Keywords
Mannich base; 1,3,4-Oxadiazole; 1,4-Benzodioxan; Antioxidant activity
Funding
- National Basic Research Program of China [2010CB126100]
- National Natural Science Foundation of China [30901854]
- Fundamental Research Funds for the Central Universities [KYZ201107]
- Special Fund for Agro-scientific Research in the Public Interest [201303023]
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A new series of Mannich base of 1,3,4-oxadiazole derivatives possessing 1,4-benzodioxan (6a-6ae) were synthesized and characterized by H-1 NMR, ESI-MS and elemental analysis. The structure of 6b was further confirmed by single crystal X-ray diffraction. All these novel compounds were screened for their in vitro antioxidant activity employing 2,2'-diphenyl-1-picrylhydrazyl radical (DPPH), 2,2'-azinobis (3-ethylbenzothiazoline-6-sulfonate) cationic radical (ABTS(+).) and ferric reducing antioxidant power (FRAP) scavenging assays. Due to the combination of 1,4-benzodioxan, 1,3,4-oxadiazoles and substituted phenyl ring, most of them exhibited nice antioxidant activities. In all of these three assays mentioned above, compounds 6f and 6e showed significant radical scavenging ability comparable to the commonly used antioxidants, BHT and Trolox. Seven compounds with representative substituents or activities were selected for further assays in chemical simulation biological systems-inhibition of microsomal lipid peroxidation (LPO) and protection against 2,2'-azobis (2-amidinopropane hydrochloride) (AAPH) induced DNA strand breakage, in which, 6f and 6e were demonstrated to be of the most potent antioxidant activities. (C) 2013 Elsevier Ltd. All rights reserved.
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