Nickel(II)-Catalyzed Cascade Vinylogous Mukaiyama 1,6-Michael/Michael Addition of 2-Silyloxyfuran with <i>N</i>-Sulfonyl-1-aza-1,3-dienes: Access to Fused Piperidine/Butyrolactone Skeletons
作者:Kang Liu、Xin Chang、Chun-Jiang Wang
DOI:10.1021/acs.orglett.6b03150
日期:2016.12.16
An unprecedented and highly efficientnickel-catalyzed cascade vinylogous Mukaiyama 1,6-Michael/Michael addition of 2-silyloxyfuran with N-sulfonyl-1-aza-1,3-dienes is reported, in which 2-silyloxyfuran was successfully employed as nucleophile and electrophile sequentially. This methodology combined with subsequent reduction provides a facile access to biologically important fused piperidine/butyrolactone
Inverse-Electron-Demand Diels-Alder Reactions of N-(Heteroarylsulfonyl)-1-aza-1,3-dienes Catalyzed by Chiral Lewis Acids
作者:Ramón Gómez Arrayás、Juan Carretero、Jorge Esquivias、Inés Alonso
DOI:10.1055/s-0028-1083276
日期:2009.1
1-azadienes with vinylethers has been demonstrated. Two catalyst systems were identified for this reaction, both relying on the presence of a coordinating 2-pyridylsulfonyl or 8-quinolylsulfonyl group at the imine nitrogen of the 1-azadiene. The combination of a 8-quinolylsulfonyl moiety and nickel(II)/DBFOX-Ph proved to be highly efficient, allowing the synthesis of substituted piperidine derivatives in good