ArticleThe Journal of organic chemistry2020
Accounting for Strong Ligand Sensitivity in Pd-Catalyzed α-Arylation of Enolates from Ketones, Esters, and Nitroalkanes.
Article in The Journal of organic chemistry, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Computational Analysis of Enantioselective Pd-Catalyzed α-Arylation of Ketones.The Journal of organic chemistry · 2020Article
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Abstract
The mechanism of the Pd-catalyzed α-arylation of three model enolates is studied focusing on an analysis of their very different reactivities. In particular, the low reactivity of nitronates under standard arylation conditions and their high sensitivity to the nature of catalytic systems are addressed. The three canonical steps for each of the reaction systems are examined, and key trends surrounding the stability of intermediates and transition states are delineated. A framework based on molecular orbital analyses and the hard-soft acid-base (HSAB) theory is advanced to explain the observed reactivity trends. The local softness of the enolates was found to be a key parameter controlling the energy of the enolate-catalyst complexes. The low reactivity of the nitroalkane enolates is attributed to slow reductive elimination, a consequence of the hard nature of the nitronate. Analysis of reactivity of nitromethane in α-arylation with Pd catalysts containing Buchwald ligands reveals destabilization of the L
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