Computational Analysis on the Pd-Catalyzed C-N Coupling of Ammonia with Aryl Bromides Using a Chelate Phosphine Ligand

Pablo Gómez-Orellana, Agustí Lledós*, Gregori Ujaque

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

The Buchwald-Hartwig amination of arylhalides with the Pd-Josiphos complex is a very useful process for the generation of primary amines using ammonia as a reactant. Density-functional theory (DFT) calculations are carried out to examine the reaction mechanism for this process. Although the general mechanism for the C-N cross-coupling reaction is known, there are still some open questions regarding the effect of a chelate phosphine ligand and the role of the base in the process. Reaction pathways involving the release of one of the arms of the phosphine ligand are compared with those where the chelate phosphine remains fully coordinated. Conformational analysis for the complex with the open chelate phosphine is required to properly evaluate the proposed pathways. The role played by the added base (t-BuO-) as a possible ligand or just as a base was also evaluated. The understanding of all of these aspects allowed us to propose a complete reaction mechanism for the Pd-catalyzed C-N coupling of arylhalides with ammonia using the chelate Josiphos ligand.

Original languageEnglish
Pages (from-to)4007-4017
Number of pages11
JournalJournal of Organic Chemistry
Volume86
Issue number5
DOIs
Publication statusPublished - 5 Mar 2021

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