racemic diene intermediate for the synthesis of tetrodotoxin is described. Key steps of the sequence leading to such a compound include the oxidative amidation of a phenol, a Cu(II)-catalyzed cyclocondensation of a nitroketone with an olefin (Machetti–DeSarlo reaction), and a nucleophilic fragmentation of the resulting isoxazoline. Several unusual reactions encountered in the course of this study are
描述了用于合成
河豚毒素的外消旋二烯中间体的途径。导致此类化合物的关键步骤包括
苯酚的氧化酰胺化,
铜(II)催化的硝基酮与烯烃的环缩合(Machetti-DeSarlo反应)以及所得
异恶唑啉的亲核裂解。本研究过程中遇到的一些异常反应已被彻底讨论。