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721041.pdf (2.04 MB)

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2021-04-29

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cc-by (c) Costa i Arnau, Anna M. et al., 2021
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/186041

Computational Study of the addition of Methanethiol to 40+ Michael Acceptors as a Model for the Bioconjugation of Cysteines

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https://doi.org/10.1021/acs.joc.1c00349

Resum

A long series of Michael acceptors are studied computationally as potential alternatives to the maleimides that are used in most antibody-drug conjugates to link Cys of mAbs with cytotoxic drugs. The products of the reaction of methanethiol (CH3SH/MeSH, as a simple model of Cys) with N-methylated ethynesulfonamide, 2-ethynylpyridinium ion, propynamide, and methyl ethynephosphonamidate (that is, with HC≡C-EWG) are predicted by the M06-2X/6-311+G(d,p) method to be thermodynamically more stable, in relation to their precursors, than that of MeSH with N-methylmaleimide and, in general, with H2C═CH-EWG; calculations with AcCysOMe and tBuSH are also included. However, for the addition of the anion (MeS-), which is the reactive species, the order changes and N-methylated 2-vinylpyridinium ion, 2,3-butadienamide, and maleimide may give more easily the anionic adducts than several activated triple bonds; moreover, the calculated ΔG⧧ values increase following the order HC≡C-SO2NHMe, N-methylmaleimide, HC≡C-PO(OMe)NHMe, and HC≡C-CONHMe. In other words, MeS- is predicted to react more rapidly with maleimides than with ethynephosphonamidates and with propynamides, in agreement with the experimental results. New mechanistic details are disclosed regarding the advantageous use of some amides, especially of ethynesulfonamides, which, however, are more prone to double additions and exchange reactions.

Matèries

Reaccions d'addició, Anions, Tiols

Matèries (anglès)

Addition reactions, Anions, Thiols

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Articles publicats en revistes (Química Inorgànica i Orgànica)

Citació

COSTA I ARNAU, Anna M., et al. Computational Study of the addition of Methanethiol to 40+ Michael Acceptors as a Model for the Bioconjugation of Cysteines. Journal of Organic Chemistry. 2021. Vol. 86, num. 10, pags. 7107-7118. ISSN 0022-3263. [consulted: 4 of August of 2026]. Available at: https://hdl.handle.net/2445/186041

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