Synthesis and Mass Spectral Characterization of Mycobacterial Phosphatidylinositol and Its Dimannosides
作者:Gregory M. Rankin、Benjamin J. Compton、Karen A. Johnston、Colin M. Hayman、Gavin F. Painter、David S. Larsen
DOI:10.1021/jo301189y
日期:2012.8.17
phosphatidylinositol (PI) and its dimannosides (PIM2, AcPIM2, and Ac2PIM2) that all possess the predominant natural 19:0/16:0 phosphatidyl acylation pattern were prepared to study their mass spectral fragmentations. Among these, the first synthesis of a fully lipidated PIM (i.e., (16:0,18:0)(19:0/16:0)-PIM2) was achieved from (±)-1,2:4,5-diisopropylidene-d-myo-inositol in 16 steps in 3% overall yield. A key feature
准备一个均具有主要的天然19:0/16:0磷脂酰酰化模式的天然分枝杆菌磷脂酰肌醇(PI)及其二甘露糖苷(PIM 2,AcPIM 2和Ac 2 PIM 2)家族,以研究其质谱碎裂。其中,完全脂化的PIM(即(16:0,18:0)(19:0/16:0)-PIM 2)的首次合成是由(±)-1,2:4,5实现的-diisopropylidene- d -肌醇肌醇在3%总产率16个步骤。该策略的关键特征是扩展了对-(3,4-二甲氧基苯基)苄基保护基在O上的应用。-3位肌醇允许在合成的后期安装硬脂酰残基。对合成的PIM进行了质谱研究,并将其与从M.的脂质提取物中鉴定出的天然PIM的报道进行了比较。牛眼BCG。这些分析证实,片段化模式可用于从细胞壁脂质提取物中鉴定特定PIM的结构。