2-Unsubstituted Imidazole N-Oxides as Novel Precursors of Chiral 3-Alkoxyimidazol-2-ylidenes Derived from trans-1,2-Diaminocyclohexane and Other Chiral Amino Compounds

Mlostoń, Grzegorz; Celeda, Malgorzata; Jasiński, Marcin; Urbaniak, Katarzyna; Boratynski, Przemyslaw J; Schreiner, Peter R; Heimgartner, Heinz

doi:10.3390/molecules24234398

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Mlostoń, G., Celeda, M., Jasiński, M., Urbaniak, K., Boratynski, P. J., Schreiner, P. R., & Heimgartner, H. (2019). 2-Unsubstituted Imidazole N-Oxides as Novel Precursors of Chiral 3-Alkoxyimidazol-2-ylidenes Derived from trans-1,2-Diaminocyclohexane and Other Chiral Amino Compounds. Molecules, 24, 4398. https://doi.org/10.3390/molecules24234398

Abstract

‘Desymmetrization’ of trans-1,2-diaminocyclohexane by treatment with α,ω-dihalogenated alkylation reagents leads to mono-NH2 derivatives (‘primary-tertiary diamines’). Upon reaction with formaldehyde, these products formed monomeric formaldimines. Subsequently, reactions of the formaldimines with α-hydroxyiminoketones led to the corresponding 2-unsubstituted imidazole N-oxide derivatives, which were used here as new substrates for the in situ generation of chiral imidazol-2-ylidenes. Upon O-selective benzylation, new chiral imidazoliu