The first total synthesis and structural determination of antibiotics K1115 B1s (alnumycins)
作者:Kuniaki Tatsuta、Sonoko Tokishita、Tomohiro Fukuda、Takaaki Kano、Tadaaki Komiya、Seijiro Hosokawa
DOI:10.1016/j.tetlet.2010.12.061
日期:2011.3
K1115 B1, isolated from the broth of Streptomyces species, was found to be a mixture of stereoisomers. Authors synthesized all stereoisomers of K1115 B1 by convergent synthesis coupling a rhamnose derivative, an isobenzofuranone, and a chiral tetraol. Comparison of 1H NMR spectra and optical rotations made it clear that the absolute structures of K1115 B1α (the major isomer) and K1115 B1β (the minor
从链霉菌属菌种的肉汤中分离出的K1115 B 1被发现是立体异构体的混合物。作者通过收敛合成鼠李糖衍生物,异苯并呋喃酮和手性四元醇的方法合成了K1115 B 1的所有立体异构体。比较1 1 H NMR谱和旋光讲明的K1115 B中的绝对结构1α(主要异构体)和K1115乙1β(次要异构体)为:(1 - [R,17小号) -和(1 - [R 17 - [R)-配置。立体异构体的旋光性表明,报道的铝霉素与K1115 B的结构相同1可能是立体异构体的另一种混合物。