10-Deacetylbaccatin III is selectively acylated to baccatin III and derivatives thereof in high yield with anhydrides (e.g. acetic anhydride), catalysed by Lewis acids. Extremely effective catalysts in this reaction are compounds of the formula MLx wherein M is a rare earth metal and L is a anion, preferably a strong electron withdrawing counterion such as triflate.
在
路易斯酸的催化下,10-去乙酰基
巴卡丁 III 与酸酐(如
乙酸酐)可选择性地酰化成
巴卡丁 III 及其衍
生物,产率很高。在此反应中极为有效的催化剂是式 MLx 的化合物,其中 M 是稀土
金属,L 是阴离子,最好是强取电子反离子,如三
氯酸盐。