Issue 11, 2025

Mechanistic study on the enantiodivergent kinetic resolution of axial chiral binaphthol via the peptide-phosphonium salt-catalyzed Atherton–Todd reaction

Abstract

Density functional theory calculations were conducted to elucidate the mechanism and stereoselectivity of the Atherton–Todd reaction-guided enantiodivergent kinetic resolution of axial chiral binaphthol catalyzed by peptide-phosphonium salts. The reaction involved the formation of two reactive phosphorus species: diphenylphosphinic chloride A and diphenylphosphinic anhydride B. Subsequent nucleophilic acylation of the deprotonated diol anion with A/B yielded chiral O-phosphorylation products. The hydrolysis of A was identified as the rate-determining step in the uncatalyzed reaction. Peptide-phosphonium salts accelerated the hydrolysis of A, reducing the energy barriers for the AB transformation, for the two phosphonium salts with diverse side chains (P8 and P12). In the kinetic resolution process, the chiral peptide-phosphonium salt catalysts simultaneously activated the diol anion and A/B through ion-pairing and multiple hydrogen bonding interactions. P8 preferentially interacted with A and the R-diol anion via favorable π–π stacking, affording the R-product, while P12 exhibited higher affinity for B and the S-diol anion due to significant steric effects, leading to the formation of the S-atropisomer. Structural analysis of five representative catalysts revealed that silicon substituents, steric effects from Bn and Boc groups, and dipeptide skeletons collectively contributed to a well-defined chiral environment. These features enhanced the catalyst's rigidity and chiral recognition ability, enabling excellent enantioselectivity.

Graphical abstract: Mechanistic study on the enantiodivergent kinetic resolution of axial chiral binaphthol via the peptide-phosphonium salt-catalyzed Atherton–Todd reaction

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Article information

Article type
Research Article
Submitted
19 Jan 2025
Accepted
10 Mar 2025
First published
11 Mar 2025

Org. Chem. Front., 2025,12, 3389-3402

Mechanistic study on the enantiodivergent kinetic resolution of axial chiral binaphthol via the peptide-phosphonium salt-catalyzed Atherton–Todd reaction

J. He, X. Luo, S. Fang, Z. Su, C. Hu and T. Wang, Org. Chem. Front., 2025, 12, 3389 DOI: 10.1039/D5QO00119F

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