A facile synthesis of emodin derivatives, emodin carbaldehyde, citreorosein, and their 10-deoxygenated derivatives and their inhibitory activities on μ-calpain
作者:Jing Lu Liang、Hyo Chang Cha、Seung Ho Lee、Jong-Keun Son、Hyeun Wook Chang、Ji-Eun Eom、Youngjoo Kwon、Yurngdong Jahng
DOI:10.1007/s12272-012-0307-4
日期:2012.3
A new procedure for the preparation of emodin carbaldehyde and citreorosein was described, in which, ω,ω′-dibromomethylemodin triacetate was prepared as a key intermediate by NBSmediated bromination of 1,3,8-triacetylemodin. Reduction of emodin and citreorosein with SnCl2 in a 1:1 mixture of HOAc and HCl afforded the corresponding anthrones in 90% and 92% yield, respectively, while the corresponding 10-desoxyemodin carbaldehyde was prepared by MnO2 oxidation of 10-desoxycitreorosein. 10-Desoxycitreorosein and emodin carbaldehyde showed feasible μ-calpain inhibitory activities with IC50 values of 20.15 and 25.77 M, respectively.
该研究描述了一种制备大黄素甲醛和香茅苷的新方法,其中,ω,ω′-二溴甲基大黄素三乙酸酯是通过 NBS 介导的 1,3,8-三乙酰基大黄素溴化反应制备的关键中间体。在 1:1 的 HOAc 和 HCl 混合物中用 SnCl2 还原大黄素和香茅素,可分别得到 90% 和 92% 的相应蒽,而相应的 10-脱氧大黄素甲醛则是通过 MnO2 氧化 10-脱氧硝基香茅素制备的。10-Desoxycitreorosein 和大黄素甲醛显示出可行的μ-钙蛋白酶抑制活性,IC50 值分别为 20.15 和 25.77 M。