The xanthine scaffold is known to be the forefather of a class of biological active molecules. Xanthine is a planar framework in which an aryl substituent linked in the 1 or 3 position is driven out of the xanthine plane because of the steric hindrance exerted by the two carbonyls. This work analyses the stereodynamics of some 1-aryl and 1,3-bisaryl-xanthines and describes the steric requirements needed
黄嘌呤支架已知是一类
生物活性分子的前身。
黄嘌呤是平面框架,其中由于两个羰基施加的空间位阻,在1或3位连接的芳基取代基被驱除出
黄嘌呤平面。这项工作分析了一些1-芳基和1,3-双芳基
黄嘌呤的立体动力学,并描述了产生稳定的杂芳族阻转异构体或非对映异构体(具有一个或两个N–C sp2立体轴)所需的空间要求。发现N-C外消旋壁垒大于25 kcal / mol。新型阻转异构体的绝对构型已使用
ECD光谱的TD-DFT模拟进行了分配。