Antiviral Activities of Methylated Nordihydroguaiaretic Acids. 1. Synthesis, Structure Identification, and Inhibition of Tat-Regulated HIV Transactivation
作者:Jih Ru Hwu、Wen Nan Tseng、John Gnabre、Paul Giza、Ru Chih C. Huang
DOI:10.1021/jm970819w
日期:1998.7.1
Nordihydroguaiaretic acid (NDGA, meso-1) possesses four phenolic hydroxyl groups. Treatment of NDGA with 0.50-4.1 equiv of dimethyl sulfate and 3.0-6.0 equiv of potassium carbonate in acetone at 56 degrees C gave nine methylated products. Eight of those mono-, di-, tri-, and tetra-O-methylated NDGAs were isolated in pure form, and their structures were identified unambiguously by spectroscopic methods
去甲二氢愈创木酸(NDGA,meso-1)具有四个酚羟基。在56℃下用0.50-4.1当量的硫酸二甲酯和3.0-6.0当量的碳酸钾在丙酮中处理NDGA,得到九种甲基化产物。单,二,三和四-O-甲基化的NDGA中有八种以纯净形式分离,并通过光谱法明确鉴定了它们的结构。通过使用4.1当量的硫酸二甲酯进行甲基化,以99%的产率从NDGA获得制备量的四甲基NDGA M4N(10)。在八个不同的甲基化NDGA(2-6和8-10)中,四-O-甲基-NDGA(10)显示出最强的抗HIV活性(IC50为11 microM)。化学合成的3'-O-甲基-NDGA((+/-)-2)与从Creosote Bush分离的木脂素具有相同的抗HIV活性(IC50 25 microM)。具有甲基化的萘酚羟基的木质素可以低成本大量生产。在药物浓度低于30 microM时,四甲基NDGA(10)比单和二甲基化NDGA具有更强的抗HIV剂。