Silylcupration and Copper-Catalyzed Carbomagnesiation of Ynamides: Application to Aza-Claisen Rearrangement
作者:Hiroto Yasui、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/bcsj.81.373
日期:2008.3.15
Treatment of ynamides with silylcopper reagents resulted in silylcupration to afford (E)-β-silylenamides, after protonolysis, in good yields with high regio- and stereoselectivity. Reaction of ynamides having an allyl group on the nitrogen with Grignard reagents in the presence of a copper catalyst resulted in carbomagnesiation across the alkynyl unit and subsequent heating provided 4-pentenenitriles via aza-Claisen rearrangement.
使用硅铜试剂处理乙炔酰胺,通过硅铜化反应,再经质子解后,以良好收率和高度区域选择性及立体选择性得到(E)-β-硅乙炔酰胺。含有氮上烯丙基的乙炔酰胺与格氏试剂在铜催化剂存在下反应,经炔基单元上的碳镁化反应,随后加热,通过氮杂克莱森重排得到4-戊烯腈。