Broadening the Scope of Group 4 Hydroamination Catalysis Using a Tethered Ureate Ligand
作者:David C. Leitch、Philippa R. Payne、Christine R. Dunbar、Laurel L. Schafer
DOI:10.1021/ja906955b
日期:2009.12.30
A broadly applicable group-4-based precatalyst for the hydroamination of primary and secondary amines was developed. Screening experiments involving a series of amide and urea proligands led to the discovery of a tetheredbis(ureate) zirconium complex with unprecedented reactivity in the intermolecular hydroamination of alkynes and the intramolecularhydroamination of alkenes. This catalyst system is
Platinum-Catalyzed Intramolecular Hydroamination of Unactivated Olefins with Secondary Alkylamines
作者:Christopher F. Bender、Ross A. Widenhoefer
DOI:10.1021/ja043278q
日期:2005.2.1
[PtCl2(H2C=CH2)]2 (2.5 mol %) and PPh3 in dioxane at 120 degrees C for 16 h led to isolation of 1-benzyl-2-methyl-4,4-diphenylpyrrolidine in 75% yield. A number of gamma- and delta-amino olefins underwent intramolecularhydroamination to form the corresponding pyrrolidine derivatives in moderate to good yield. The reaction displayed excellent functional group compatibility and low moisture sensitivity.