Synthesis and Reduction Kinetics of Five Ibuprofen–Nitroxides for Ascorbic Acid and Methyl Radicals
作者:Kota Sasaki、Tomohiro Ito、Hirotada G. Fujii、Shingo Sato
DOI:10.1248/cpb.c16-00347
日期:——
The hybrid compounds 1-5 comprised of five nitroxides with ibuprofen were synthesized and their reduction rate for ascorbic acid (AsA) and methyl radicals were measured in comparison with 3-hydroxy-tetramethylpyrrolidine-1-oxyl (PROXYL) 6. The rate constants in reduction reaction with 200-fold excess of AsA were determined in following order: 1 (0.42+/-0.06), 3 (0.17+/-0.06), 2 (0.10+/-0.05), and 6
合成了由五种氮氧化物与布洛芬组成的杂化化合物1-5,与3-羟基-四甲基吡咯烷-1-氧基(PROXYL)6相比,测定了它们对抗坏血酸(AsA)和甲基自由基的还原率。按以下顺序确定200倍过量AsA的还原反应:1(0.42 +/- 0.06),3(0.17 +/- 0.06),2(0.10 +/- 0.05)和6(0.09 +/- 0.02) M-1s-1)。其余两个空间屏蔽的氮氧化物4和5几乎不与AsA反应。在与200倍以上过量的Fenton试剂产生的具有更高反应性的甲基基团的反应中,2、4和5的还原率按以下降序排列:2(1.1 +/- 0.2),4(0.76+ /-0.09)和5(0.31 +/- 0.03 M-1s-1)。