作者:Spencer Knapp、Gregori J. Morriello、Santosh R. Nandan、Thomas J. Emge、George A. Doss、Ralph T. Mosley、Lijian Chen
DOI:10.1021/jo010355g
日期:2001.8.1
and C-3'". An intramolecular reductive amination reaction has been used to prepare model diazepanones. Analysis of 40 and two of its diastereomers by NMR spectroscopy, X-ray crystallography, and molecular modeling indicates a close relative configurational and conformational match between 40 and the liposidomycin diazepanone degradation product 43 and allows the assignment of stereochemistry of the
脂质霉素包括抑制细菌肽聚糖合成的复杂核苷类抗生素。它们的结构(1、2)具有核苷,呋喃核糖苷,二氮杂酮和脂质区域。几个立体定位中心尚未分配,包括在地西pan酮区域内的三个:C-6',C-2'“和C-3'”。分子内还原胺化反应已用于制备模型二氮杂酮。通过NMR光谱,X射线晶体学和分子建模对40个及其两个非对映异构体进行分析,结果表明40与脂环霉素二氮杂酮降解产物43之间的构象和构象匹配非常接近,并且可以将天然产物的立体化学指定为[ C-6'(R),C-2'“(R),C-3'”(R)]或[C-6'(S),C-2'“(S),