Total Synthesis of a Mycobactin S, a Siderophore and Growth Promoter of <i>Mycobacterium Smegmatis</i>, and Determination of its Growth Inhibitory Activity against <i>Mycobacterium tuberculosis</i>
作者:Jingdan Hu、Marvin J. Miller
DOI:10.1021/ja963968x
日期:1997.4.1
total synthesis of mycobactins, represented by a mycobactin S, was achieved by a convergent approach. Two hydroxamic acid residues, 28 and 40b, were prepared from commercially available Nα-Cbz-l-lysine via dimethyldioxirane oxidations. Cyclization of hydroxylamine 34 to a seven-membered hydroxamic acid, 35, was mediated by DCC, DMAP, and DMAP·HCl. The use of a [2-(trimethylsilyl)ethoxy]methyl group
以分枝杆菌素 S 为代表的分枝杆菌素的一般全合成是通过收敛方法实现的。两种异羟肟酸残基 28 和 40b 是通过二甲基二环氧乙烷氧化从市售的 Nα-Cbz-l-赖氨酸制备的。羟胺 34 环化为七元异羟肟酸 35 是由 DCC、DMAP 和 DMAP·HCl 介导的。使用 [2-(三甲基甲硅烷基) 乙氧基] 甲基作为 Nα-Cbz-Ne-羟基-Ne-棕榈酰基-l-赖氨酸甲酯 (28) 的羟基保护基团对于该合成至关重要。生物学测试表明,合成的分枝杆菌素 S 是一种有效的结核分枝杆菌 H37Rv 生长抑制剂,尽管它与结核分枝杆菌的铁载体生长促进剂分枝杆菌素 T 仅在一个立体中心不同。