Mechanism of the Platinum(II)-Catalyzed Hydroamination of 4-Pentenylamines

Published

Journal Article

© 2016 American Chemical Society. The mechanism of the platinum(II)-catalyzed intramolecular hydroamination of benzyl 4-pentenylamines has been evaluated under stoichiometric and catalytic conditions. Reaction of a benzyl 2,2-disubstituted 4-pentenylamine with [(PPh3)Pt(μ-Cl)Cl]2 forms a thermally sensitive platinum amine complex that undergoes irreversible, intramolecular ligand exchange with the pendant C=C bond to form a reactive platinum π-alkene complex. The π-alkene complex undergoes rapid, outer-sphere C-N bond formation, evidenced by the anti addition of Pt and N across the complexed C=C bond, to form a thermally stable zwitterionic platinamethylpyrrolidinium complex. The zwitterionic complex is rapidly and exergonically deprotonated by free amine to form a neutral, bicyclic azaplatinacyclobutane complex that likely exists as a discrete 1:1 adduct with ammonium salt in the nonpolar reaction medium and that represents the resting state of the catalytic cycle. Turnover-limiting intramolecular protodemetalation of the azaplatinacyclobutane-ammonium adduct followed by ligand exchange releases the 2-methylpyrrolidine product.

Full Text

Duke Authors

Cited Authors

  • Bender, CF; Brown, TJ; Widenhoefer, RA

Published Date

  • January 25, 2016

Published In

Volume / Issue

  • 35 / 2

Start / End Page

  • 113 - 125

Electronic International Standard Serial Number (EISSN)

  • 1520-6041

International Standard Serial Number (ISSN)

  • 0276-7333

Digital Object Identifier (DOI)

  • 10.1021/acs.organomet.5b00821

Citation Source

  • Scopus