Synthesis of polyhydroxylated aromatic mandelic acid amides and their antioxidative potential
作者:Jakob P Ley、Heinz-Jürgen Bertram
DOI:10.1016/s0040-4020(00)01136-4
日期:2001.2
Six hydroxymandelic acid amides of phenolic amines were synthesized by condensation of 3,4-dihydroxymandelic or 4-hydroxy-3-methoxymandelic acid N-succinimidyl esters and several phenolic benzylamino and phenethylamino hydrochlorides in moderate to good yield. The radical scavenging activities determined by 2,2-diphenyl-1-picrylhydrazyl assay and superoxide trapping assay were superior compared to standards L-ascorbic acid, a-tocopherol, and butylated hydroxytoluene (BHT). The antioxidative activities tested by accelerated autoxidation of bulk Lipids were 2-3.5 times more potent compared to standards alpha -tocopherol and BHT. 3,4-Dihydroxymandelic acid dopamide (4b) and 4-hydroxy-3-methoxymandelic acid dopamide (4a) showed the best overall performance as antioxidants. (C) 2001 Elsevier Science Ltd. All rights reserved.