Oxidation chemistry and biochemistry of the central mammalian alkaloid 1-methyl-6-hydroxy-1,2,3,4-tetrahydro-.beta.-carboline
作者:Fa Zhang、R. N. Goyal、C. LeRoy Blank、Glenn Dryhurst
DOI:10.1021/jm00079a010
日期:1992.1
The electrochemical oxidation of the central mammalian alkaloid 1-methyl-6-hydroxy-1,2,3,4-tetrahydro-beta-carboline (1) has been studied in neutral aqueous solution at a pyrolytic graphite electrode (PGE). Voltammograms of 1 show two closely spaced oxidation peaks, Ia and IIa. At potentials less positive than the peak potential (Ep) for peak Ia, 1 is oxidized to a radical intermediate which dimerizes
已在热解石墨电极(PGE)的中性水溶液中研究了哺乳动物中央生物碱1-甲基-6-羟基-1,2,3,4-四氢-β-咔啉(1)的电化学氧化。1的伏安图显示两个紧密间隔的氧化峰Ia和IIa。在电位小于峰值Ia的峰值电位(Ep)的情况下,1被氧化成自由基中间体,该中间体二聚化得到5,5'-bi(1-methyl-6-hydroxy-1,2,3, 4-四氢-β-咔啉)(5和6)。在比峰1a的电位更强的Ep上,假定的自由基中间体被进一步电氧化为以C(5)为中心的碳正离子,在离子-底物反应中与1反应生成5和6或与水反应生成最终的1-甲基1,2,3,4-四氢-β-咔啉-5,6-二酮(12)。二聚体5和6在PGE处产生两个可逆的氧化峰,第二个对应于在1伏安图中观察到的峰IIa。由于5和6是易于氧化的化合物,因此它们仅在受控电势电氧化的初始阶段被观察到1.酪氨酸酶/ O2,人铜蓝蛋白/ O2和过氧化物酶/ H2