Design and Synthesis of 4,6-Di-<i>tert</i>-butyl-2,3-dihydro-5-benzofuranols as a Novel Series of Antiatherogenic Antioxidants
作者:Kunio Tamura、Yoshiaki Kato、Akira Ishikawa、Yasuharu Kato、Motomu Himori、Mitsutaka Yoshida、Yoshiaki Takashima、Tsukasa Suzuki、Yoshiki Kawabe、Osamu Cynshi、Tatsuhiko Kodama、Etsuo Niki、Makoto Shimizu
DOI:10.1021/jm030062a
日期:2003.7.1
Antioxidants have been considered as potential antiatherogenic agents by inhibiting oxidation of low-density lipoprotein (LDL), albeit vitamin E, a natural antioxidant, has failed to show reduction on atherosclerosis in clinical trials. We have rationally designed and synthesized a novel series of antioxidants, 4,6-di-tert-butyl-2,3-dihydro-5-benzofuranols, to overcome the clinical limitation of vitamin E. In vitro, the compounds showed a potent inhibitory effect on lipid peroxidation detected as 2-methyl-6-(p-methoxyphenyl)-3,7-dihydroimidazo[1,2-a]pyrazin3-one (MCLA)-dependent chemiluminescence in linoleic acid autoxidation. They also inhibited the LDL oxidation induced by Cu2+, and the inhibition is more potent than that of vitamin E and probucol. In vivo, 4,6-di-tert-butyl-2,3-dihydro-2,2-dipentyl-5-benzofuranoI (BO-653, 1f), an optimal compound, showed the highest concentration in plasma and LDL fraction in Watanabe heritable hyperlipidemic rabbits, due to its high affinity to LDL. The isolated LDL samples from the If-treated rabbits showed potent resistibility to LDL oxidation. Compound If has been taken into clinical trials.