Transformations of<i>N</i>-Allyl-<i>N</i>-(phenylethynyl)arenesulfonamides into 2,2-Disubstituted 4-Pentenenitriles through Aza-Claisen Rearrangement that Follows Carbomagnesiation
作者:Hiroto Yasui、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/cl.2007.32
日期:2007.1
Treatment of N-allyl-N-(phenylethynyl)arenesulfonamides with Grignard reagents under copper catalysis resulted in carbomagnesiation across the alkynyl parts. The carbomagnesiations yielded 2-magnesio-3-aza-1,5-hexadienes, which underwent the aza-Claisen rearrangement upon heating. The rearrangement followed by elimination of the arenesulfonyl groups provided 2,2-disubstituted 4-pentenenitriles.
在铜催化下,N-烯丙基-N-(苯乙炔基)芳磺酰胺与格氏试剂反应,导致炔烃部分发生碳镁化。碳镁化反应生成2-镁-3-氮杂-1,5-己二烯,加热后经历氮杂克莱森重排。重排后通过消除芳磺酰基团,提供了2,2-二取代的4-戊烯腈。