Abstract X-ray crystallographic analysis revealed that the palladium-catalyzed β-allylation of yohimbine proceeded in a (7S)-selective manner. The crystal structure had an indolenine unit that was generally unstable in air. A stereoselective outcome was obtained when the palladium π-allyl complex approached yohimbine from the less-hindered pro-S side. However, during reserpine allylation—because the structure
摘要 X 射线晶体学分析表明,
钯催化的
育亨宾 β-烯丙基化反应以 (7S) 选择性方式进行。晶体结构具有在空气中通常不稳定的假
吲哚单元。当
钯 π-烯丙基复合物从受阻较少的 pro-S 侧接近
育亨宾时,获得了立体选择性结果。然而,在
利血平烯丙基化期间——因为
利血平的结构是 transoid-3、15 环连接的结构——
钯 π-烯丙基复合物从两侧接近:pro-S 和 pro-R。开发了一种计算方法来讨论这种选择性。提供了反应的实验细节和考虑因素。