Chemical Structure and Key Physicochemical Properties

7-Bromoimidazo[1,2-a]pyridine-3-carbaldehyde belongs to the imidazo[1,2-a]pyridine family of bicyclic heteroaromatic compounds. The core scaffold is formed by the fusion of an imidazole ring with a pyridine ring sharing a nitrogen atom, producing a planar, electron-rich aromatic system with favorable drug-like properties including moderate lipophilicity and the ability to participate in hydrogen-bonding interactions.

This compound carries two orthogonal reactive handles: (1) an aldehyde (–CHO) group at the C-3 position of the imidazole ring, which is electrophilic and amenable to a wide range of condensation, reductive amination, and Wittig-type reactions; and (2) a bromine atom at the C-7 position of the pyridine ring, which serves as a handle for palladium-catalyzed cross-coupling reactions such as Suzuki–Miyaura, Negishi, and Buchwald–Hartwig amination.

The presence of both functionalities on a single heteroaromatic scaffold makes this building block especially valuable for the convergent, step-efficient synthesis of structurally complex heterocyclic libraries. The aromatic system also contributes to UV absorption, which aids in HPLC monitoring of reactions and purification steps.

Note: Specific physicochemical data (molecular weight, melting point, logP, solubility values) should be confirmed against the current Aladdin Scientific certificate of analysis and SDS for lot-specific accuracy.

Applications in Medicinal Chemistry and Synthesis

The imidazo[1,2-a]pyridine scaffold is a privileged structure in medicinal chemistry, appearing in numerous bioactive natural products and approved pharmaceuticals. Its balanced aromatic character, metabolic stability relative to simpler heterocycles, and capacity for multipoint target interactions make it a frequent choice in hit-to-lead and lead optimization campaigns.

Cross-Coupling Chemistry: The C-7 bromine enables efficient palladium-catalyzed Suzuki–Miyaura coupling with aryl- and heteroarylboronic acids to introduce diverse (hetero)aryl groups, Negishi coupling with organozinc reagents for alkyl and aryl diversification, and Buchwald–Hartwig amination for direct C–N bond formation. These reactions are typically carried out under standard Pd(0)/Pd(II) catalyst systems (e.g., Pd(PPh₃)₄, Pd(dppf)Cl₂) with appropriate base and solvent.

Aldehyde Reactivity: The C-3 aldehyde participates in reductive amination with primary and secondary amines (using NaBH₃CN or NaBH(OAc)₃ as reductant) to furnish aminomethyl derivatives, condensation with active methylene compounds or hydrazines to yield imines, hydrazones, and oximes, and Wittig or Horner–Wadsworth–Emmons olefination to install vinyl groups for further functionalization.

Sequential Functionalization: Because the two functional groups exhibit orthogonal reactivity, researchers can perform sequential transformations—first modifying the aldehyde under mild conditions, then engaging the aryl bromide in cross-coupling, or vice versa—enabling rapid construction of structurally diverse analogue sets from a single starting material.

Specific reaction yields and conditions referenced in literature should be verified; consult primary literature and review flags for this article.

Handling, Safety, and Storage Recommendations

General Handling Precautions: As with all fine chemical reagents, 7-Bromoimidazo[1,2-a]pyridine-3-carbaldehyde should be handled using standard laboratory safety practices. Researchers should wear appropriate personal protective equipment (PPE) including nitrile gloves, laboratory coat, and safety goggles. Handling should be performed in a well-ventilated fume hood, particularly when weighing the solid, to minimize inhalation of dust or vapors.

Storage: Store the compound in a tightly sealed container in a cool, dry, and well-ventilated location, protected from direct light and moisture. Prolonged exposure to air, humidity, or elevated temperatures may lead to gradual degradation of the aldehyde functionality. Refer to the Aladdin Scientific Safety Data Sheet (SDS) for this product for authoritative hazard classification and first-aid measures specific to this compound.

Solubility and Preparation of Stock Solutions: The compound is expected to show solubility in common polar aprotic solvents such as DMSO, DMF, and acetonitrile, which are frequently used for preparing stock solutions for biological screening. Solubility in aqueous buffers is typically limited and may require co-solvent addition. Actual solubility values should be confirmed experimentally for the specific lot used.

Waste Disposal: Dispose of waste material in accordance with local regulations and institutional guidelines for chemical waste. Do not pour reagent down the drain without appropriate treatment.

Quality, Purity, and Procurement Guidance

Purity Considerations: For sensitive synthetic applications such as palladium-catalyzed cross-coupling or biological assays requiring accurate dose–response relationships, the purity of the starting material is critically important. Researchers should request a Certificate of Analysis (CoA) from Aladdin Scientific for each lot, which will specify the purity (typically assessed by HPLC or NMR), identity confirmation (e.g., ¹H NMR, mass spectrometry), and physical appearance.

Lot-to-Lot Consistency: When running comparative experiments or multi-step syntheses requiring reproducibility, it is advisable to procure sufficient quantity from a single lot where possible. If switching lots, perform a brief quality check (e.g., TLC, NMR spot-check) before committing to large-scale synthesis.

Ordering: 7-Bromoimidazo[1,2-a]pyridine-3-carbaldehyde is available from Aladdin Scientific under SKU B734852. Contact Aladdin Scientific's technical support or your regional representative for availability, pricing, custom quantities, and bulk pricing inquiries. Refer to Aladdin Scientific's standard ordering, payment, and shipping policies for procurement details.

Regulatory and Export Considerations: Researchers in certain jurisdictions should verify whether any import/export restrictions apply to this compound. Aladdin Scientific can advise on documentation requirements for international shipments.