Highly Efficient Biomimetic Total Synthesis and Structural Verification of Bistratamides E and J fromLissoclinum bistratum
作者:Shu-Li You、Jeffery W. Kelly
DOI:10.1002/chem.200305504
日期:2004.1.5
cell line. Here we report the first total syntheses of bistratamides E (1) and J (2) in overall yields of 19 and 34 %, respectively. The thiazole substructures have been synthesized by oxidation of their corresponding thiazoline substructures, which were obtained from cysteine containing peptides using a novel biomimetic approach wherein Val-Cys dipeptide units were converted to thiazolines by a bisphosphonium
在过去的20年中,从海洋生物中分离出的含杂环的环状肽衍生的天然产物,其有趣的生物活性吸引了许多合成和天然产物化学家的兴趣。Bistratamides EJ是最近从双歧Lissoclinum bistratum中分离出来的此类天然产物的成员,对人结肠肿瘤(HCT-116)细胞系表现出细胞毒活性。在这里,我们报告了双链酰胺E(1)和J(2)的首次总合成,总收率分别为19%和34%。噻唑亚结构是通过氧化相应的噻唑啉亚结构而合成的,所述噻唑亚结构是使用新颖的仿生方法从含半胱氨酸的肽中获得的,其中Val-Cys二肽单元被双salt盐转化为噻唑啉。使用PyBOP和DMAP的组合可以有效地促进最终的大环化。这种方法允许使用容易获得的Fmoc保护的氨基酸来制备复杂的含噻唑和恶唑啉的天然产物。