Zirconium Complexes Supported by Imidazolones: Synthesis, Characterization, and Application of Precatalysts for the Hydroamination of Aminoalkenes
摘要:
Dimeric zirconium benzyl and amide complexes supported by an imidazolone framework have been successfully synthesized and fully characterized. The amide complexes were found to be effective catalysts for intramolecular hydroamination of primary and secondary amines.
Highly Active and Diastereoselective N,O- and N,N-Yttrium Complexes for Intramolecular Hydroamination
作者:Frank Lauterwasser、Paul G. Hayes、Warren E. Piers、Laurel L. Schafer、Stefan Bräse
DOI:10.1002/adsc.201000892
日期:2011.5
The intramolecularhydroamination of aminoalkynes and unactivated aminoalkenes catalyzed by yttrium N,O‐ and N,N‐complexes has been investigated. The N,N‐yttrium complexes are highlyactive, catalyzing the conversion of a wide range of terminal aminoalkenes at room temperature, and internal aminoalkenes at elevated temperature, to yield pyrrolidine and piperidine products in high yields. A high diastereoselectivity