Physicochemical Properties and Structure

(2-Chloro-1,3-thiazol-5-yl)methanol (molecular formula C₄H₄ClNOS; MW 149.60 g/mol) is a five-membered heterocyclic compound featuring a 1,3-thiazole ring substituted at the 2-position with a chlorine atom and at the 5-position with a hydroxymethyl (–CH₂OH) group.

The thiazole ring system contains both a sulfur and a nitrogen atom, conferring aromatic stability and a degree of electron deficiency at C-2 that makes the C–Cl bond amenable to nucleophilic displacement. The primary alcohol at C-5 is a versatile handle for further chemical elaboration. The compound is typically isolated as a pale solid or low-melting material; exact melting point and solubility data should be confirmed against the certificate of analysis supplied with each lot.

Common organic solvents (e.g., ethanol, DMSO, DCM, EtOAc) are generally suitable for dissolution; aqueous solubility is limited due to the lipophilic thiazole and chloro substituents.

Synthetic Utility and Applications

(2-Chloro-1,3-thiazol-5-yl)methanol is widely employed as a bifunctional building block in medicinal chemistry and agrochemical research. Its two distinct reactive sites allow sequential or orthogonal functionalization strategies:

• C-2 Chloro substitution: The electron-deficient C-2 position undergoes nucleophilic aromatic substitution (S_NAr) with amines, thiols, and alkoxides, enabling the preparation of 2-amino-, 2-thio-, and 2-alkoxy-thiazole derivatives relevant to pharmaceutical lead optimization.
• Hydroxymethyl transformations: The primary alcohol can be oxidized to the corresponding aldehyde or carboxylic acid, converted to a leaving group (mesylate, tosylate, halide) for nucleophilic substitution, esterified, etherified, or subjected to Mitsunobu coupling. These transformations expand the chemical space accessible from this single starting material.
• Cross-coupling: Following conversion of the alcohol to an appropriate electrophile, palladium-catalyzed cross-coupling reactions (e.g., Suzuki, Buchwald–Hartwig) at C-2 are feasible for introducing aryl or heteroaryl groups.

The compound is particularly valuable in the synthesis of thiazole-containing pharmacophores associated with kinase inhibition, antimicrobial activity, and other biological targets.

Handling, Safety, and Storage Guidelines

Always consult the Safety Data Sheet (SDS) provided by Aladdin Scientific before working with (2-Chloro-1,3-thiazol-5-yl)methanol. While detailed hazard classification should be verified in the current SDS, general precautions for chloro-heterocyclic compounds apply:

• Personal Protective Equipment (PPE): Wear appropriate chemical-resistant gloves, safety goggles, and a laboratory coat. Work in a well-ventilated fume hood to minimize inhalation exposure.
• Storage: Store in a tightly sealed container in a cool, dry, well-ventilated area, away from moisture, oxidizers, and strong bases. Refrigerated storage (2–8 °C) may be appropriate to preserve stability; confirm with the product SDS and certificate of analysis.
• Stability: The compound should be kept away from prolonged exposure to light and moisture. Inert atmosphere (N₂ or Ar) blanketing is advisable when handling hygroscopic or air-sensitive lots.
• Waste Disposal: Dispose of residues in accordance with local, national, and institutional regulations for halogenated organic waste.

All safety information provided here is general guidance only; always defer to the current lot-specific SDS for authoritative hazard data.

Quality, Purity, and Procurement Considerations

For research applications, purity is a critical parameter that directly affects experimental reproducibility. When procuring (2-Chloro-1,3-thiazol-5-yl)methanol (Aladdin Scientific SKU: C482066), researchers should consider the following:

• Certificate of Analysis (CoA): Request the lot-specific CoA to verify purity (typically assessed by HPLC or GC), melting point, NMR identity confirmation, and water content.
• Purity grades: For routine synthesis screening, standard reagent-grade material is generally sufficient. For quantitative biological assays or reference standard applications, higher purity grades should be specified.
• Packaging: Order in quantities appropriate to anticipated usage to minimize repeated freeze-thaw or open-close cycles that can compromise product integrity.
• Verification on receipt: Upon receipt, confirm that the container is intact, properly labeled, and that the physical appearance matches the description in the CoA. Any discrepancies should be reported to Aladdin Scientific customer service promptly.