Synthesis of brasilibactin A and confirmation of absolute configuration of β-hydroxy acid fragment
作者:Yongcheng Ying、Jiyong Hong
DOI:10.1016/j.tetlet.2007.09.112
日期:2007.11
A synthesis of brasilibactin A, a cytotoxic siderophore from the actinomycete of Nocardia brasiliensis, and three unnatural diastereomers of the natural product is described. Four possible diastereomers of the β-hydroxyacid fragment were prepared via asymmetric aldol reactions and used to synthesize brasilibactin A and its diastereomers. Careful analysis of 1H NMR data confirmed that brasilibactin
描述了巴西巴西诺卡氏菌放线菌的细胞毒性铁载体Brasilibactin A和天然产物的三种非天然非对映异构体的合成。通过不对称醛醇缩合反应制备了四种可能的β-羟酸片段的非对映异构体,并用于合成brasilibactin A及其非对映异构体。仔细分析1 H NMR数据证实,brasilibactin A具有17 S,18 R绝对立体化学。
Total Synthesis and Biological Evaluation of Transvalencin Z
作者:Kathryn M. Nelson、Christine E. Salomon、Courtney C. Aldrich
DOI:10.1021/np200972s
日期:2012.6.22
is a naturalproduct from Nocardia transvalensis with relatively potent and selective antimycobacterial activity against Mycobacterium smegmatis, making it an attractive target for structure–activity and mechanism of action studies. The total synthesis of the four possible diastereomers of transvalencin Z was completed (1a–d), and the absolute configurations were defined using chemical synthesis, HPLC
耐药性结核病的新出现的全球流行病迫切需要确定新的疾病治疗方法。Transvalencin Z ( 1 ) 是来自Nocardia transvalensis的天然产物,对耻垢分枝杆菌具有相对强效和选择性的抗分枝杆菌活性,使其成为结构-活性和作用机制研究的有吸引力的目标。Transvalencin Z的四种可能的非对映异构体的全合成完成(1a - d),绝对构型是使用化学合成、HPLC 保留时间和旋光度测量定义的。令人惊讶的是,反式瓦伦星 Z 非对映异构体中没有一种对一组微生物病原体表现出任何抑制活性,包括几种分枝杆菌。