Electrochemical oxidation of 1,3,8-trihydroxy-6-methylanthraquinone, emodin, in dry alkaline methanol under a constant current of 0.05 A for 10 h under an applied potential difference of 15 V at room temperature resulted, for the first time, in an efficient and selective hydroxymethylation at C-2. The structure of the product was established from the detailed spectral analyses of its trimethyl ether and tetraacetylated derivative.
1,3,8- 三羟基-6-甲基蒽醌(大黄素)在干燥的碱性甲醇中以 0.05 A 的恒定电流进行 10 小时的电化学氧化,并在室温下施加 15 V 的电位差,首次在 C-2 处实现了高效和选择性的羟甲基化。通过对其三甲醚和四乙酰化衍生物进行详细的光谱分析,确定了产物的结构。