Acetylation of the C-6 hydroxyl group in oridonin (1), which is difficult by the use of acetic anhydride in pyridine, was investigated using acetic anhydride in the presence of some Lewis acids. A reagent system of acetic anhydride in the presence of a catalytic amount of boron trifluoride etherate was shown to be effective for this purpose. This reagent system was shown to be useful for selective acetylation of the alcoholic group (s) in compounds which have both alcoholic and phenolic hydroxyl groups.
研究人员在一些
路易斯酸存在的情况下,使用
醋酸酐对奥里多宁(1)中的 C-6 羟基进行了乙酰化反应。结果表明,在催化量的
三氟化硼醚酸存在下的
醋酸酐试剂体系可以有效地实现这一目的。这种试剂体系对具有醇羟基和
酚羟基的化合物中醇羟基的选择性乙酰化非常有用。