Tyrosinase-promoted oxidation of 5, 6-dihydroxyindole-2-carboxy1ic acid to melanin. Isolation and characterization of oligomer intermediates
作者:Patrizia Palumbo、Marco d'Ischia、Giuseppe Prota
DOI:10.1016/s0040-4020(01)83461-x
日期:1987.1
Enzymic oxidation of 5,6-dihydroxyindole-2-carboxylic acid () in the presence of catalytic amounts of L-dopa led to a complex mixture of oligomeric products, three of which were isolated as the acetyl methyl ester derivatives and identified as 5,6,5',6'-tetraacetoxy-2,2'- dicarbomethoxy-4, 4'-biindolyl (), 5,6,5',6'-tetraacetoxy-2,2'-dicarbomethoxy-4, 7'-biindolyl (), 5,6,5',6',5“,6”-esaacetoxy-2,2'
在催化量的L-多巴存在下5,6-二羟基吲哚-2-羧酸()的酶氧化导致形成复杂的低聚物产物混合物,其中三种产物被分离为乙酰甲基酯衍生物,鉴定为5, 6,5',6'-四乙酰氧基-2,2'-二甲氧基甲氧基-4,4'-联吲哚基(),5,6,5',6'-四乙酰氧基-2,2'-二甲氧基甲氧基-4,7'- Biindolyl(),5,6,5',6',5“,6” -esaacetoxy-2,2',2“-三甲氧基-4,4':7',4”-叔吲哚基()。当在金属离子(例如Cu 2+)存在下进行氧化时,获得了类似的产物图案。观察到的趋势 讨论了关于朱兰素的结构和生物合成的关于在4-位和在较小程度上的7-位进行氧化偶合的方法。