Benzotriazole-Mediated Synthesis of Heterocyclic Compounds

Benzotriazole has emerged as a versatile mediator in the construction of diverse heterocyclic frameworks, leveraging its unique electronic properties and leaving-group ability. In one strategy, N-acylbenzotriazoles act as stable acyl donors, enabling selective C–N, C–O and C–C bond formations under mild conditions. Multicomponent and one-pot protocols exploit benzotriazole’s dual role as both activating group and internal leaving group, delivering triazines, imidazoles and fused bicyclic scaffolds in a single step. Microwave-assisted sequences further accelerate ring closures, reducing reaction times and supporting gram-scale synthesis. Cross-coupling variants employ benzotriazole-derived halides or pseudohalides in palladium-catalysed Buchwald–Hartwig processes to assemble benzotriazole-quinazoline hybrids and related polyheterocycles. Collectively, these methodologies provide modular access to nitrogen-rich heterocycles with applications spanning pharmaceuticals, agrochemicals and functional materials. The tunable reactivity of the benzotriazole core continues to inspire sustainable, high-yielding routes and innovative scaffold designs with global significance for drug discovery and advanced material development.

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Benzotriazole-Mediated Synthesis of Heterocyclic Compounds publication trend

The graph below shows the total number of articles in benzotriazole-mediated synthesis of heterocyclic compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Benzotriazole: A nitrogen-rich aromatic heterocycle used as an activating and leaving group in organic synthesis.

Heterocyclic compound: An organic molecule featuring rings that contain at least one atom other than carbon, commonly nitrogen, oxygen or sulfur.

Acylation: Introduction of an acyl group (R–C=O) into a molecule, often mediated by acyl donors like N-acylbenzotriazoles.

N-Acylbenzotriazole: A benzotriazole derivative bearing an acyl substituent, acting as a stable and versatile acyl transfer reagent.

Buchwald–Hartwig cross-coupling: A palladium-catalysed reaction that forms C–N bonds between aryl (pseudo)halides and amines.

Multicomponent reaction: A synthetic process in which three or more reactants combine in a single vessel to form a product incorporating elements of all components.

References

1. A one-pot, multicomponent reaction for the synthesis of novel 2-alkyl substituted 4-aminoimidazo[1,2- a ][1,3,5]triazines. RSC Advances (2018).
2. Synthesis, Antitumor and Antiviral In Vitro Activities of New Benzotriazole-Dicarboxamide Derivatives. Frontiers in Chemistry (2021).
3. A convenient access to 1-substituted-2-azinyl-1-ethanones via acylation of alkylated azines with N-acylbenzotriazoles. Arkivoc (2005).
4. Synthetic Utility of N -Acylbenzotriazoles. SynOpen (2023).
5. Microwave-Assisted Sequential One-Pot Synthesis of 8-Substituted Pyrazolo[1,5-a][1,3,5]triazines. Molecules (2021).
6. SYNTHESIS OF 2-AMINO-SUBSTITUTED-12H-BENZOTRIAZOLE[2,3-B]QUINAZOLINE-12-IONS BY BUCHWALD-HARTWIG CROSS-COMBINATION REACTION. Universum Chemistry & biology (2024).