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Palladium Complexes Based on Ylide-Functionalized Phosphines (YPhos): Broadly Applicable High-Performance Precatalysts for the Amination of Aryl Halides at Room Temperature.


ABSTRACT: Palladium allyl, cinnamyl, and indenyl complexes with the ylide-substituted phosphines Cy3 P+ -C- (R)PCy2 (with R=Me (L1) or Ph (L2)) and Cy3 P+ -C- (Me)PtBu2 (L3) were prepared and applied as defined precatalysts in C-N coupling reactions. The complexes are highly active in the amination of 4-chlorotoluene with a series of different amines. Higher yields were observed with the precatalysts in comparison to the in situ generated catalysts. Changes in the ligand structures allowed for improved selectivities by shutting down ?-hydride elimination or diarylation reactions. Particularly, the complexes based on L2 (joYPhos) revealed to be universal precatalysts for various amines and aryl halides. Full conversions to the desired products are reached mostly within 1?h reaction time at room temperature, thus making L2 to one of the most efficient ligands in C-N coupling reactions. The applicability of the catalysts was demonstrated for aryl chlorides, bromides and iodides together with primary and secondary aryl and alkyl amines, including gram-scale applications also with low catalyst loadings of down to 0.05?mol?%. Kinetic studies further demonstrated the outstanding activity of the precatalysts with TOF over 10.000?h-1 .

SUBMITTER: Tappen J 

PROVIDER: S-EPMC7186839 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Palladium Complexes Based on Ylide-Functionalized Phosphines (YPhos): Broadly Applicable High-Performance Precatalysts for the Amination of Aryl Halides at Room Temperature.

Tappen Jens J   Rodstein Ilja I   McGuire Katie K   Großjohann Angela A   Löffler Julian J   Scherpf Thorsten T   Gessner Viktoria H VH  

Chemistry (Weinheim an der Bergstrasse, Germany) 20200228 19


Palladium allyl, cinnamyl, and indenyl complexes with the ylide-substituted phosphines Cy<sub>3</sub> P<sup>+</sup> -C<sup>-</sup> (R)PCy<sub>2</sub> (with R=Me (L1) or Ph (L2)) and Cy<sub>3</sub> P<sup>+</sup> -C<sup>-</sup> (Me)PtBu<sub>2</sub> (L3) were prepared and applied as defined precatalysts in C-N coupling reactions. The complexes are highly active in the amination of 4-chlorotoluene with a series of different amines. Higher yields were observed with the precatalysts in comparison to t  ...[more]

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