A Lewis acid catalyzed FriedelâCrafts reaction of electron rich aromatics with 3-alkyl-3-hydroxy-2-oxindole (5) has been developed. The methodology provides a straightforward access to the core of azonazine (2) sharing an all-carbon quaternary stereocenter at the tetracyclic ring junction.
                                    我们开发了一种
路易斯酸催化的富电子
芳烃与 3-烷基-3-羟基-2-
吲哚(5)的 FriedelâCrafts 反应。该方法提供了一种直接进入四环交界处具有全碳四元立体中心的氮杂嗪(2)核心的途径。