Oxetane Synthesis in Medicinal Chemistry

Oxetanes are four-membered oxygen heterocycles that have emerged as versatile motifs in drug design owing to their high ring strain, three-dimensional shape and capacity to modulate key physicochemical properties. The inherent ring strain of oxetanes increases polarity and reduces lipophilicity relative to unstrained analogues, thereby improving aqueous solubility, metabolic stability and target binding in many cases. These features have promoted the incorporation of oxetane units as bioisosteres of carbonyl groups and carboxylic acids, enabling fine-tuning of pKa, LogD and hydrogen-bonding profiles. Despite their attractiveness, the synthesis of oxetanes poses significant challenges due to the difficulty of forming the strained ring without unwanted ring-opening pathways. Recent advances have addressed these obstacles through innovative strategies such as C–H functionalisation of native substrates, photoredox-mediated decarboxylative cyclisations and transition-metal-catalysed cycloaddition protocols. These methods offer streamlined access to diverse oxetane scaffolds, including late-stage modifications of complex molecules. Together, these developments have broadened the practical toolkit for assembling oxetane derivatives and have underscored their global significance in accelerating the discovery of more effective and selective therapeutic agents.

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Oxetane Synthesis in Medicinal Chemistry publication trend

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Technical terms

Oxetane: A four-membered cyclic ether characterised by significant ring strain and unique three-dimensional shape.

Bioisostere: A chemical substituent or group that mimics the biological properties of another while often imparting improved pharmacokinetic or physicochemical traits.

C–H functionalisation: A synthetic strategy that directly transforms unactivated carbon–hydrogen bonds into C–X bonds, enabling streamlined molecular modifications.

Photoredox catalysis: A technique that employs light-activated catalysts to mediate single-electron transfer reactions, facilitating bond formations under mild conditions.

Late-stage functionalisation: The modification of complex molecules at a final or advanced stage of synthesis to introduce new functional groups without de novo assembly.

References

1. Oxetanes: Recent Advances in Synthesis, Reactivity, and Medicinal Chemistry. Chemical Reviews (2016).
2. Oxetanes in Drug Discovery Campaigns. Journal of Medicinal Chemistry (2023).
3. Oxetane Synthesis via Alcohol C–H Functionalization. Journal of the American Chemical Society (2023).
4. Direct conversion of amino acids to oxetanol bioisosteres via photoredox catalysis. Chemical Science (2023).