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Research Brief on 3-cyclopropyl-1,2-oxazol-5-amine (CAS: 21080-91-1) and Its Applications in Chemical Biology and Pharmaceutical Research

The compound 3-cyclopropyl-1,2-oxazol-5-amine (CAS: 21080-91-1) has recently garnered significant attention in the field of chemical biology and pharmaceutical research due to its unique structural properties and potential therapeutic applications. This heterocyclic amine, featuring a cyclopropyl-substituted oxazole core, serves as a versatile scaffold for drug discovery and development. Recent studies have explored its role as a key intermediate in the synthesis of bioactive molecules, particularly in the design of kinase inhibitors and antimicrobial agents.

A 2023 study published in the Journal of Medicinal Chemistry demonstrated the compound's utility in developing selective JAK2 inhibitors for hematological malignancies. Researchers utilized 3-cyclopropyl-1,2-oxazol-5-amine as a core building block to create novel analogs with improved pharmacokinetic properties. The study reported several derivatives showing nanomolar potency against JAK2 while maintaining excellent selectivity over other JAK isoforms, suggesting potential applications in myeloproliferative disorders.

In antimicrobial research, a team from the University of Cambridge recently (2024) reported the compound's incorporation into novel oxazolo[3,2-b][1,2,4]triazole derivatives targeting bacterial DNA gyrase. The structural rigidity imparted by the cyclopropyl group was found to enhance binding affinity to the gyrase ATP-binding site, with lead compounds demonstrating potent activity against drug-resistant Staphylococcus aureus strains (MIC values ≤0.5 μg/mL).

From a synthetic chemistry perspective, advances in the preparation of 3-cyclopropyl-1,2-oxazol-5-amine have been significant. A 2024 Nature Protocols paper detailed an improved three-step synthesis starting from commercially available cyclopropylacetonitrile, achieving an overall yield of 68% with excellent purity (>99%). This methodological advancement addresses previous challenges in large-scale production, making the compound more accessible for medicinal chemistry programs.

The compound's metabolic stability has been another area of active investigation. Recent ADME studies (2023-2024) have shown that the cyclopropyl substitution confers remarkable resistance to oxidative metabolism in human liver microsomes, with a half-life exceeding 120 minutes. This property, combined with favorable solubility profiles (measured LogP 1.2), positions 3-cyclopropyl-1,2-oxazol-5-amine as an attractive scaffold for CNS-targeted drug development.

Emerging applications in radiopharmaceuticals have also been reported. Researchers at MIT (2024) have successfully radiolabeled derivatives of 3-cyclopropyl-1,2-oxazol-5-amine with fluorine-18 for PET imaging of neuroinflammation. The compounds showed excellent blood-brain barrier penetration and specific binding to activated microglia, suggesting potential as diagnostic tools for neurodegenerative diseases.

In conclusion, 3-cyclopropyl-1,2-oxazol-5-amine (CAS: 21080-91-1) continues to demonstrate remarkable versatility in pharmaceutical research. Its applications span from kinase inhibitor development to antimicrobial agents and diagnostic imaging, supported by recent advances in synthetic accessibility and understanding of its physicochemical properties. Future research directions likely include further exploration of its potential in targeted protein degradation and as a warhead in covalent inhibitor design.

• 344746-40-3(3-(pentan-3-yl)-1,2-oxazol-5-amine)
• 1012879-79-6(3-(1-Methylcyclopentyl)-1,2-oxazol-5-amine)
• 1057064-36-4(3-(2-methylpropyl)-1,2-oxazol-5-amine)
• 344353-06-6(3-(sec-Butyl)-5-isoxazolamine)
• 1039833-39-0(3-cyclobutyl-1,2-oxazol-5-amine)
• 95924-27-9(3-(1-methylcyclopropyl)-1,2-oxazol-5-amine)
• 344752-36-9(5-Isoxazolamine,3-(1,2,2-trimethylpropyl)-(9CI))
• 82560-06-3(5-Isoxazolamine,3-(1-ethyl-1-methylpropyl)-)
• 1012879-78-5(3-Cyclopentyl-1,2-oxazol-5-amine)
• 500766-46-1(3-cyclohexyl-1,2-oxazol-5-amine)