Zirconium-Mediated Intramolecular Coupling Reactions of Unsaturated Anilines. Diastereoselective Synthesis of Azetidines
摘要:
Imine complexes of zirconocene, generated by a beta-hydrogen abstraction process, which possess a carbon-carbon multiple bond, undergo inter-or intramolecular carbometalation to afford 1,4-cyclohexanediamine or cycloalkylaniline derivatives depending on the relative position of the unsaturated moiety with respect to the imine complex. A new diastereoselective synthesis of azetidines has been developed by treatment of azazirconacyclopentanes with iodine.
Diastereo- and enantioselective reductive amination of cycloaliphatic ketones by preformed chiral palladium complexes
作者:Armando Cabrera、Pankaj Sharma、F. Javier Pérez-Flores、Luis Velasco、J. Luis Arias、Laura Rubio-Pérez
DOI:10.1039/c4cy00058g
日期:——
An efficient preformed chiral palladium catalyzed direct diastereo- and enantioselectivereductive amination of un- and substituted cycloaliphatic ketones with primary aryl amines has been developed.
An Aminopyridinato Titanium Catalyst for the Intramolecular Hydroaminoalkylation of Secondary Aminoalkenes
作者:Jaika Dörfler、Besnik Bytyqi、Sascha Hüller、Nicola M. Mann、Christian Brahms、Marc Schmidtmann、Sven Doye
DOI:10.1002/adsc.201500287
日期:2015.7.6
2‐(methylamino)pyridinato titanium complex initially synthesized by Kempe is used as catalyst for efficient intramolecularhydroaminoalkylation reactions of secondaryaminoalkenes. The corresponding reactions of N‐aryl‐substituted 1‐aminohept‐6‐enes and 1‐aminohex‐5‐enes directly give access to 2‐methylcyclohexyl‐ or 2‐methylcyclopentylamines in good yields. In addition, intramolecularhydroaminoalkylations of an N‐alkyl‐substituted