Total synthesis and NMR conformational study of signal peptidase II inhibitors, globomycin and SF-1902 A5
作者:Toshihiro Kiho、Mizuka Nakayama、Hiroshi Kogen
DOI:10.1016/s0040-4020(03)00110-8
日期:2003.3
A stereoselective total synthesis of an antibiotic, globomycin (1a), and its congener, SF-1902 A5 (1b), was achieved. Two convergent macrocyclization routes via macrolactamization or macrolactonization to form 1a are described. A conformational study by means of NMR spectroscopy was performed in several solvents. The 1H NMR spectrum of 1a indicated that the amide proton of only the l-allo-Thr residue
立体选择性地合成了抗生素球蛋白(1a)及其同类物SF-1902 A 5(1b)。描述了通过大内酰胺化或大内酰胺化形成1a的两种会合大环化途径。在几种溶剂中通过NMR光谱进行了构象研究。1a的1 H NMR光谱表明,只有l- allo -Thr残基的酰胺质子与氢键有关。溶液相的结构不同于X射线的结构。