Discovery, Total Synthesis and Key Structural Elements for the Immunosuppressive Activity of Cocosolide, a Symmetrical Glycosylated Macrolide Dimer from Marine Cyanobacteria
作者:Sarath P. Gunasekera、Yang Li、Ranjala Ratnayake、Danmeng Luo、Jeannette Lo、Joseph H. Reibenspies、Zhengshuang Xu、Michael J. Clare-Salzler、Tao Ye、Valerie J. Paul、Hendrik Luesch
DOI:10.1002/chem.201600674
日期:2016.6.6
first total synthesis of cocosolide (1) along with its [α,α]‐anomer (26) and macrocyclic core (28), thus leading to the confirmation of the structure of natural 1. The convergent synthesis featured Wadsworth–Emmons cyclopropanation, Sakurai annulation, Yamaguchi macrocyclization/dimerization reaction, α‐selective glycosidation and β‐selective glycosidation. Compounds 1 and 26 potently inhibited IL‐2 production
从初步鉴定为Symploca sp。的海洋蓝细菌中分离出一种新的二聚体大环内酯木糖吡喃糖苷cocosolide(1)。来自关岛。结构是通过NMR光谱学,HRMS,X射线衍射研究和基础水解产物的Mosher分析的组合来确定的。它的碳骨架非常类似于从海绵Myriastra clavosa分离得到的clavosolides A–D的骨架,其生物活性尚不清楚。我们进行了cocosolide(1)及其[ α,α ]-异头物(26)和大环核(28)的首次全合成,从而证实了天然1的结构。。收敛合成的特征是Wadsworth-Emmons环丙烷化,Sakurai环化,Yamaguchi大环化/二聚化反应,α-选择性糖苷化和β-选择性糖苷化。化合物1和26以依赖T细胞受体的方式和独立方式有效抑制IL-2的产生。完整的活性需要糖部分以及完整的二聚体结构的存在。Cocosolide还以剂量依赖的方式抑制了抗CD3刺激的T细胞的增殖。