N,O-acetals. The key to this strategy, chemo- and stereoselective synthesis of N,O-acetals, was achieved by the Pd-catalyzed addition of sulfonyl-protected homopropargylic amines to alkoxyallene. The N,O-acetals generated in this way were combined with Au-catalyzed cycloisomerization to give an access to 2,6-disubstituted piperidines with stereochemical flexibility.
我们开发了一种概念上新的合成策略,该策略利用不稳定的无环 N,O-
缩醛的立体
化学信息。该策略的关键,N,O-
缩醛的
化学和立体选择性合成,是通过 Pd 催化将磺酰基保护的高
炔丙胺加成到烷氧基
丙二烯上来实现的。以这种方式生成的 N,O-
缩醛与 Au 催化的环异构化相结合,以提供具有立体
化学灵活性的 2,6-二取代
哌啶。