A synthesis of bikaverin (7,12-dihydro-6,11-dihydroxy-3,8-dimethoxy-1-methyl-10H-benzo[b]xanthene-7,10,12-trione) and some related benzoxanthones and quinones
作者:Dana Kjær、Anders Kjær、Elisabeth Risbjerg
DOI:10.1039/p19830002815
日期:——
Bikaverin, a biologically interesting fungal pigment with the highly oxidised benzoxanthone structure (1), has been synthesized in two steps from 2-hydroxy-4-methoxy-6-methylacetophenone (6f) and dimethyl 3,5-dimethoxyhomophthalate (7f). The synthesis involves a base-catalysed reaction between these substrates to give the substituted 11-hydroxybenzoxanthone (8f) in about 25% yield, followed by oxidation
比卡维林是一种生物学上有趣的真菌颜料,具有高度氧化的苯并蒽酮结构(1),它是由2-羟基-4-甲氧基-6-甲基苯乙酮(6f)和3,5-二甲氧基邻苯二甲酸二甲酯(7f)分两步合成的。合成涉及这些底物之间的碱催化反应,以约25%的收率得到取代的11-羟基苯并蒽酮(8f),然后在受控条件下用三氟过氧乙酸将其直接氧化为比卡维林,收率约为35%。操作简单,加上起始原料易于获得,使该合成与之前报道的两种双刀豆素的合成相比具有优势。还描述了另外五个11-羟基苯并氧杂蒽的制备,以及其中四个的氧化转化。