Asymmetric Inverse-Electron-Demand 1,3-Dipolar Cycloaddition of C,N-Cyclic Azomethine Imines: An Umpolung Strategy
作者:Takuya Hashimoto、Masato Omote、Keiji Maruoka
DOI:10.1002/anie.201100331
日期:2011.4.4
chiral dicarboxylic acid (see scheme). Employment of vinylogous aza‐enamines as novel dipolarophiles was also implemented to establish a new concept of the inverse‐electron‐demand umpolung 1,3‐dipolarcycloaddition. Bz=benzoyl, EDG=electron‐donating group.
Enantioselective Formal Alkenylations of Imines Catalyzed by Axially Chiral Dicarboxylic Acid Using Vinylogous Aza-Enamines
作者:Takuya Hashimoto、Hidenori Kimura、Keiji Maruoka
DOI:10.1002/anie.201003600
日期:2010.9.10
In the zone: The use of vinylogous aza‐enamaines (hydrazones) as a source of an alkenyl group has been achieved (see scheme). Unmasking of the aza‐enamine moiety opens up a novel approach for the preparation of chiral allylic amines bearing an electron‐withdrawing alkene moiety functionalized at the electron‐deficient β position.