A concise and stereoselective synthesis of a CDE-seco limonoid related to ohchinolide and nimbolidin was accomplished in eleven and twelve steps, respectively, from α-cyclocitral. Opening of the C ring was first attempted by a retro-Claisen reaction, whereby a very unusual rearrangement occurred. However, the ring-opening was successfully accomplished by a selective Baeyer-Villiger reaction.
通过十一个步骤和十二个步骤,我们分别从δ-环
柠檬醛中合成了一种与ohchinolide 和 nimbolidin 相关的 CDE-seco limonoid。首先尝试通过逆克莱森反应打开 C 环,在此过程中发生了非常不寻常的重排。不过,通过选择性的拜尔-维利格反应,开环成功完成。