Stereodefined <i>N,O</i>-Acetals: Pd-Catalyzed Synthesis from Homopropargylic Amines and Utility in the Flexible Synthesis of 2,6-Substituted Piperidines
作者:Haejin Kim、Young Ho Rhee
DOI:10.1021/ja2116298
日期:2012.3.7
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。