Ruthenium-Catalyzed Chemoselective N-Allyl Cleavage: Novel Grubbs Carbene Mediated Deprotection of Allylic Amines
作者:Benito Alcaide、Pedro Almendros、Jose M. Alonso
DOI:10.1002/chem.200305236
日期:2003.12.5
discovered. The first examples of the catalytic deprotection of allylic amines with reagents other than palladium catalysts have been achieved through Grubbs carbene mediated reaction. Significantly, the catalytic system directs the reaction toward the selective deprotection of allylic amines (secondary as well as tertiary) in the presence of allylic ethers. A variety of substrates, including enantiomerically
已经发现了Grubbs卡宾配合物的新应用。已经通过Grubbs卡宾介导的反应获得了用除钯催化剂以外的试剂对烯丙基胺进行催化脱保护的第一个实例。重要的是,催化系统将反应引导至在烯丙基醚存在下烯丙基胺(仲和叔)的选择性脱保护。也可以使用多种底物,包括对映体纯的多功能哌啶。该新方法比钯催化的方法更方便,化学选择性且操作简单。当前的机理假说调用了氮辅助的钌催化的异构化,然后水解烯胺中间体。我们认为,反应中涉及的反应性物种可能是Rubond; H物种,而不是Grubbs卡宾本身。因此,可以根据氢化物机理发生异构化。吲哚并立定型生物碱的制备说明了这种钌催化的烯丙基裂解的合成效用。