Catalytic Asymmetric Alkynylation of C1-Substituted C,N-Cyclic Azomethine Imines by CuI/Chiral Brønsted Acid Co-Catalyst
作者:Takuya Hashimoto、Masato Omote、Keiji Maruoka
DOI:10.1002/anie.201104017
日期:2011.9.12
up: The title reaction was developed for the synthesis of chiral tetrahydroisoquinoline derivatives with a tetrasubstituted carbon center at the C1‐position (see scheme, Bz=benzoyl, pybox=2,6‐bis(2‐oxazolinyl)pyridine). The reaction was facilitated effectively by the co‐catalyst system composed of copper(I)/Ph‐pybox and an axiallychiraldicarboxylicacid.
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.