Role of association in chiral catalysis: from asymmetric synthesis to spin selectivity

"This is the peer reviewed version of the following article: Ageeva, Aleksandra A., Ekaterina A. Khramtsova, Ilya M. Magin, Peter A. Purtov, Miguel A. Miranda, and Tatyana V. Leshina. 2018. Role of Association in Chiral Catalysis: From Asymmetric Synthesis to Spin Selectivity. Chemistry A European Journal 24 (70). Wiley: 18587 600. doi:10.1002/chem.201801625, which has been published in final form at https://doi.org/10.1002/chem.201801625. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."[EN] The origin of biomolecules in the pre-biological period is still a matter of debate, as is the unclarified nature of the differences in enantiomer properties, especially for the medically important activity of chiral drugs. With regards to the first issue, significant progress was made in the last decade of the 20th century through experimental confirmation of Frank's popular theory on chiral catalysis in spontaneous asymmetric synthesis. Soai examined the chiral catalysis of the alkylation of achiral aldehydes by achiral reagents. Attempts to model this process demonstrated the key role of chiral compounds associates as templates for chiral synthesis. However, the elementary mechanism of alkylation and the role of free radicals in this process are still incompletely understood. Meanwhile, the influence of external magnetic fields on chiral enrichment in the radical path of alkylation has been predicted. In addition, the role of chiral dyad association in another radical process, electron transfer (ET), has been recently demonstrated by the following methods: chemically induced dynamic nuclear polarisation (CIDNP), NMR spectroscopy, XRD and photochemistry. The CIDNP analysis of ET in two dyads has revealed a phenomenon first observed for chiral systems, spin selectivity, which results in the difference between the CIDNP enhancement coefficients of dyad diastereomers. These dyads are linked systems consisting of the widespread drug (S)-naproxen (NPX) or its R analogue and electron donors, namely, (S)-tryptophan and (S)-N-methylpyrrolidine. Because NPX is one of the most striking examples of the difference in the therapeutic properties of enantiomers, the appearance of spin selectivity in dyads with (S)- and (R)-NPX and S donors can shed light on the chemical nature of these differences. This review is devoted to discussing the chemical nature of spin selectivity and the role of chiral associates in the chiral catalysis of an elementary radical reaction: ET in chiral dyads.The work was supported by the Russian Science Foundation (18-13-00047).Ageeva, A.; Khramtsova, E.; Magin, I.; Purtov, P.; Miranda Alonso, MÁ.; Leshina, T. (2018). 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