First total synthesis of glabramycin B and revision of its relative configuration
作者:Masaoki Yamamoto、Ken Ishigami、Hidenori Watanabe
DOI:10.1016/j.tet.2017.04.061
日期:2017.6
Structural revision of glabramycin B, which is an antibacterial 10-membered lactone isolated from a fermentation broth of Neosartorya glabra, was achieved by enantioselective synthesis of our proposed structure. The correct structure of glabramycin B was presumed on comparison with related compounds, and synthesis of it was succeeded via dianion alkylation, Shiina's lactonization and Stille cross-coupling
glabramycin B是一种结构修饰,它是从Neosartorya glabra的发酵液中分离出的一种抗菌的10元内酯,是通过我们提出的结构的对映选择性合成而实现的。通过与相关化合物进行比较,推定了glabramycin B的正确结构,并通过二阴离子烷基化,Shiina的内酯化和Stille交叉偶联成功合成了glabramycinB 。通过这种合成,我们能够纠正报告的结构错配,并确定glabramycin B的相对构型为10 S *,11 S *,15 R *,20 S *。