Synthetic studies on virantmycin. 1. Total synthesis of (±)-virantmycin and determination of its relative stereochemistry
作者:Yoshiki Morimoto、Fuyuhiko Matsuda、Haruhisa Shirahama
DOI:10.1016/0040-4020(96)00609-6
日期:1996.8
a ring inversion occurs in their piperidine ring system and determined the relative stereochemistry by capturing each half-chair conformer as cyclic carbamates 26 and 27, respectively. Utilizing this protocol total syntheses of (±)-1 and its diastereomer (±)-2 have been accomplished and the relative stereochemistry of virantmycin has been established as shown in 1.
通过分子内的氮烯加成反应作为关键步骤,已经开发出了有效的,立体定向的途径来制备维他霉素的四氢喹啉环模型3和4。在4和3的NOE实验中,我们发现在其哌啶环系统中发生了环反转,并通过分别捕获每个半椅子构象异构体为环状氨基甲酸酯26和27来确定相对立体化学。利用该方案,已经完成了(±)-1及其非对映异构体(±)-2的全部合成,并且建立了维兰霉素的相对立体化学,如图1所示。