Amidine Synthesis and Application in Organic Chemistry

Amidines, characterised by the C(=NH)NH functional group, occupy a central role in modern organic synthesis and chemical biology. Classical preparations often rely on the reaction of nitriles with amines under acidic or basic conditions to give amidines directly, but recent strategies exploit metal catalysis, cycloaddition sequences and in situ activation of precursors to improve selectivity and scope. These advances have enabled access to a broad array of N-substituted, N-acyl and N-sulfonyl amidines, including cyclic frameworks, under milder and more sustainable conditions. Their capacity to serve as hydrogen‐bond donors and acceptors makes amidines valuable ligands for transition‐metal complexes, and their inherent bioactivity has been harnessed in the design of enzyme inhibitors and pharmaceutical leads. In materials science, amidine motifs contribute to polymer cross-linking and supramolecular assembly, underlining both their academic interest and industrial relevance.

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Amidine Synthesis and Application in Organic Chemistry publication trend

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Technical terms

Amidine: An organic moiety featuring a carbon doubly bonded to an NH and singly bonded to another nitrogen atom, often represented as RC(=NH)NR′.

N-sulfonylamidine: An amidine derivative in which one nitrogen bears a sulfonyl substituent (−SO₂R), enhancing electron withdrawal and modulating reactivity.

N-acyl amidine: An amidine in which one nitrogen is acylated (−COR), frequently accessed via cycloaddition of acyl azides and enamines.

Cycloaddition: A class of pericyclic reactions in which two or more unsaturated molecules combine to form a cyclic adduct, exemplified by [3 + 2] annulation.

N-heterocyclic carbene: A stable, neutral two‐electron donor ligand featuring a divalent carbon atom within a ring, widely used to activate metals for catalysis.

Dimroth rearrangement: A base-mediated ring‐opening and ring‐closing process in heterocycles (notably triazoles) that results in positional exchange of substituents.

References

1. Aerobic synthesis of N-sulfonylamidines mediated by N-heterocyclic carbene copper(I) catalysts. Beilstein Journal of Organic Chemistry (2020).
2. Synthesis of Cyclic N-Acyl Amidines by [3 + 2] Cycloaddition of N-Silyl Enamines and Activated Acyl Azides. Molecules (2022).
3. Regioselective synthesis of heterocyclic N-sulfonyl amidines from heteroaromatic thioamides and sulfonyl azides. Beilstein Journal of Organic Chemistry (2020).