Cyclooxygenase-2 Inhibitory 1,4-Naphthoquinones from Impatiens balsamina L.
摘要:
在两种新的 1,4-萘醌钠盐(3-羟基-2{[3-羟基-1,4-二氧代(2-萘基)]乙基钠}萘-1、4-二酮(imatienolate)钠盐(1)和 2-羟基-3-(2-羟乙基)萘-1,4-二酮(balsaminolate)钠盐(2),它们是从 Impatiens balsamina L.(凤仙花科植物)的花冠中分离出来的。(凤仙花科)的花冠中分离出来。通过光谱技术阐明了它们的结构。我们的研究结果为使用 I. balsamina L. 治疗关节风湿、疼痛和肿胀提供了证据。
Studies on the oxidative cyclization of 3-hydroxyalkyl-1,2,4-trialkoxynaphthalenes and synthetic application for the biologically active natural compound rhinacanthone
The oxidative intramolecular cyclization of 3-hydroxyalkyl-1,2,4-trimethoxynaphthalenes was investigated. A series of 1,2-naphthoquinone fused cyclic ethers were synthesized directly from 3-hydroxyalkyl-1,2,4-trimethoxynaphthalenes by exposure to diammonium cerium (IV) nitrate. To understand the reaction mechanism, the intramolecular cyclization of 3-hydroxyalkyl-naphthoquinones that were formed as reaction intermediates was also examined. The results suggested that the reaction proceeds by a stepwise oxidation-cyclization mechanism. Using this methodology, five-step synthesis of rhinacanthone was achieved with high yield. (C) 2013 Elsevier Ltd. All rights reserved.