Ethyl 2-aminooxazole-4-carboxylate

This compound is typically obtained as a crystalline solid ranging from white to pale yellow. Its molecular formula is C6H8N2O3, corresponding to a molecular weight of 156.14. The melting point generally falls within the range of 138–142 ℃, reflecting a well-defined crystal lattice. The calculated density is approximately 1.33 g/cm³ under ambient conditions. It exhibits good solubility in polar organic solvents including methanol, ethanol, dimethyl sulfoxide, and dimethylformamide, while showing moderate solubility in ethyl acetate and dichloromethane and limited solubility in water and non-polar solvents such as hexane. The molecule contains an oxazole ring with an amino group at the 2-position and an ethyl ester at the 4-position. The primary amine is susceptible to acylation, alkylation, and condensation reactions, while the ester functionality can be hydrolyzed to the corresponding carboxylic acid or reduced to the alcohol. Storage in tightly sealed containers protected from light and moisture at reduced temperature (2–8 ℃) is recommended to prevent hydrolysis and decomposition. Contact with strong oxidizing agents, strong acids, and strong bases should be avoided.

Ethyl 2-aminooxazole-4-carboxylate is a bifunctional heteroaromatic compound featuring an oxazole ring substituted with a primary amine at the 2-position and an ethyl ester at the 4-position. The oxazole core, a five-membered aromatic heterocycle containing both oxygen and nitrogen atoms, provides an electron-deficient platform capable of engaging in π-stacking and hydrogen bonding interactions through the ring nitrogen and oxygen. The amino group at the 2-position offers nucleophilic reactivity for amide formation, reductive amination, or diazotization, enabling introduction of diverse pharmacophoric elements. The ester at the 4-position serves as a protected carboxylic acid equivalent, providing a handle for further functionalization through hydrolysis, transesterification, or reduction to the corresponding alcohol. This combination of a nucleophilic amine and an electrophilic ester on a compact heteroaromatic scaffold makes the compound a valuable building block for constructing more complex molecules in medicinal chemistry, where the oxazole ring can serve as a bioisostere for amide bonds or other heterocycles while the orthogonal reactive sites enable systematic structural variation.

In drug discovery, this aminooxazole ester is employed as a building block for synthesizing kinase inhibitors and antimicrobial agents. The amino group enables convenient amide coupling with carboxylic acid-containing pharmacophores, while the ester can be hydrolyzed to the carboxylic acid for salt formation or further derivatization. The oxazole core is a privileged scaffold in medicinal chemistry, appearing in compounds targeting cancer, inflammation, and infectious diseases, where it can participate in key hydrogen bonding interactions with enzyme active sites.

The compound serves as a precursor for constructing fused heterocyclic systems such as oxazolo[4,5-d]pyrimidines, oxazolo[4,5-b]pyridines, and other nitrogen-oxygen ring systems through cyclocondensation reactions. These fused heterocycles are investigated for their pharmacological properties, with the oxazole core providing conformational rigidity and hydrogen-bonding capacity beneficial for target recognition. The amino and ester groups enable further functionalization after heterocycle formation.

The ester functionality can serve as a prodrug moiety, enhancing oral bioavailability of carboxylic acid-containing drugs. After administration, enzymatic hydrolysis releases the active oxazole-4-carboxylic acid pharmacophore. This strategy has been explored for improving the pharmacokinetic profiles of anti-inflammatory and antiviral agents, with the amino group providing an additional handle for solubility modulation.

As a versatile synthetic intermediate, ethyl 2-aminooxazole-4-carboxylate participates in diverse transformations including N-acylation, N-alkylation, and palladium-catalyzed cross-coupling reactions after conversion of the amino group to other functionalities. The ester can be reduced to the corresponding alcohol for ether formation or hydrolyzed to the acid for amide coupling. Its utility extends to the synthesis of natural product analogs and functional materials where the oxazole ring imparts desirable properties such as metal coordination and metabolic stability.

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