Nitroso Compound Reactions in Organic Synthesis
Summary
Nitroso compounds, characterised by the R–N=O functionality, occupy a central position in modern synthetic chemistry owing to their versatile reactivity and ability to forge carbon–nitrogen bonds under mild conditions. Classical applications include nitroso-ene and hetero-Diels–Alder cycloadditions, which enable rapid assembly of oxazine and amino-functionalised frameworks. Recent advances have extended these transformations into catalytic and biocatalytic realms, harnessing metal catalysts, organocatalysts and enzymes to generate acylnitroso intermediates in situ from hydroxamic acids or N-hydroxycarbamates. Such methodologies offer high selectivity, step economy and environmental compatibility by employing air or benign oxidants. Beyond small-molecule construction, nitroso chemistry underpins routes to complex alkaloids, pharmaceutical scaffolds and functional materials. Innovations in continuous flow and photochemical approaches have improved the scalability and safety of nitroso generation, while asymmetric variants are emerging to deliver enantioenriched products. The global significance of nitroso reactions spans agrochemistry, medicinal agents and advanced polymers, reflecting their adaptability across diverse industrial and academic settings.
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Nitroso Compound Reactions in Organic Synthesis publication trend
The graph below shows the total number of articles in nitroso compound reactions in organic synthesis across all publications each year (not limited to Nature Index journals).
Technical terms
Nitroso compound: An organic species featuring an R–N=O group, often acting as a dienophile or ene partner in cycloadditions.
Acylnitroso: A transient nitroso derivative obtained by oxidation of hydroxamic acids or carbamates, highly reactive in ene and Diels–Alder reactions.
Nitroso-ene reaction: A pericyclic process in which a nitroso species adds across an alkene to form new C–N and C–O bonds.
Hetero-Diels–Alder reaction: A [4+2] cycloaddition between a diene and a heterodienophile such as a nitroso compound, yielding oxazine scaffolds.
Continuous flow photochemistry: A technique using flowing reaction streams irradiated by light to generate reactive intermediates safely and at scale.
Biocatalysis: The use of enzymes to promote chemical transformations under mild, often aqueous, conditions with high selectivity.
References
- Aerobic C−N Bond Formation through Enzymatic Nitroso‐Ene‐Type Reactions**. Angewandte Chemie International Edition (2023).
- Peroxidase-induced C–N bond formation via nitroso ene and Diels–Alder reactions. Green Chemistry (2023).
- Continuous Flow Synthesis of Nitrosoarenes via Photochemical Rearrangement of Aryl Imines. The Journal of Organic Chemistry (2023).
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