2-(Benzo[d]oxazol-2-ylthio)acetic Acid: Handling & Use Protocol

2-(Benzo[d]oxazol-2-ylthio)acetic acid is a benzoxazole-based thioether carboxylic acid reagent (Aladdin SKU A690611) valued as a versatile synthetic intermediate in medicinal chemistry and heterocyclic compound research.

Product Name

2-(Benzo[d]oxazol-2-ylthio)acetic acid

SKU

A690611

Molecular Formula

C₉H₇NO₃S

Functional Groups

Benzoxazole ring, thioether linkage, carboxylic acid

Typical Application

Synthetic intermediate for heterocyclic and medicinal chemistry

Storage Recommendation

Cool, dry, dark conditions; tightly sealed container

Scope and Reagent Overview

This protocol covers the safe receipt, storage, preparation, and laboratory use of 2-(Benzo[d]oxazol-2-ylthio)acetic acid (Aladdin SKU A690611). The compound belongs to the class of benzoxazole-derived thioether carboxylic acids and serves as a key building block in the synthesis of biologically active heterocyclic molecules. Its structure combines a planar benzo[d]oxazole aromatic system with a flexible thioacetic acid spacer, enabling diverse downstream transformations including amide coupling, esterification, and further heterocycle elaboration.

This document is intended for research scientists and laboratory personnel working in synthetic organic chemistry, medicinal chemistry, or related disciplines.

Safety and Storage

Personal Protective Equipment (PPE): Wear appropriate laboratory coat, chemical-resistant gloves (nitrile recommended), and safety glasses when handling this compound. Work in a well-ventilated fume hood to minimise inhalation exposure to dust or vapours.

Storage Conditions: Store the sealed container in a cool (recommended 2–8 °C or per label instruction), dry, and dark location away from incompatible materials such as strong oxidisers and strong bases. Ensure the container is tightly closed after each use to prevent moisture absorption and degradation.

Disposal: Dispose of waste material containing this compound according to local, institutional, and national chemical waste regulations. Do not pour down the drain without prior authorisation from your environmental health and safety office.

Note: Always consult the Safety Data Sheet (SDS) supplied with the product for complete hazard information before use.

Solution Preparation and Solubility

Recommended Solvents: 2-(Benzo[d]oxazol-2-ylthio)acetic acid is expected to dissolve in polar aprotic solvents such as dimethyl sulfoxide (DMSO) and dimethylformamide (DMF), as well as in alkaline aqueous solutions (e.g., dilute NaOH or Na₂CO₃). Solubility in neat water or non-polar solvents is anticipated to be limited due to the compound's amphiphilic character.

Preparation Procedure:

1. Allow the sealed vial to equilibrate to room temperature before opening to prevent moisture condensation on the solid.
2. Weigh the required amount of compound accurately using an analytical balance in a fume hood.
3. Transfer to a clean, dry glassware vessel and add the chosen solvent in portions, mixing gently after each addition.
4. If necessary, apply gentle warming (not exceeding 40 °C) and sonication to aid dissolution. Avoid prolonged heating to prevent decomposition.
5. Filter through a 0.2 µm syringe filter if a particle-free solution is required for downstream reactions.
6. Prepare stock solutions fresh or store aliquots at −20 °C under inert atmosphere to maintain compound integrity.

Review flag: Exact solubility values (mg/mL) in specific solvents are not confirmed in the source material and should be experimentally verified or sourced from the SDS/TDS before reporting.

Application in Synthesis

2-(Benzo[d]oxazol-2-ylthio)acetic acid is primarily employed as a synthetic building block in heterocyclic chemistry. The carboxylic acid moiety allows direct participation in:

• Amide bond formation: Coupling with primary or secondary amines using standard peptide-coupling reagents (e.g., EDC/HOBt, HATU) to yield benzoxazolylthio acetamide derivatives of potential pharmacological interest.
• Esterification: Reaction with alcohols under acid catalysis or via activated ester intermediates to produce ester analogues useful for prodrug design or further functionalisation.
• Nucleophilic substitution at the benzoxazole C-2 position: The thioether linkage may be exploited in displacement reactions to introduce diverse nucleophiles, enabling library synthesis.
• Coordination chemistry: The sulfur and carboxylate donor atoms may participate in metal chelation, making this compound a candidate ligand precursor in organometallic or bioinorganic studies.

When planning reactions, consider that the benzo[d]oxazole ring system is susceptible to hydrolysis under strongly acidic or basic aqueous conditions; adjust reaction pH and temperature accordingly.

Quality Control and Verification

To verify compound identity and purity prior to use in critical experiments, the following analytical techniques are recommended:

• Melting Point Determination: Measure the melting point and compare with the value reported on the Certificate of Analysis (CoA) supplied by Aladdin Scientific.
• ¹H NMR Spectroscopy: Record the proton NMR spectrum in a suitable deuterated solvent (e.g., DMSO-d₆). Key expected signals include aromatic protons from the benzoxazole ring system and the methylene (–CH₂–) protons of the acetic acid moiety.
• HPLC Purity Analysis: Run a reverse-phase HPLC assay to confirm purity; compare against the CoA purity specification.
• Mass Spectrometry: Confirm the molecular ion peak corresponding to the molecular formula C₉H₇NO₃S (exact mass to be confirmed from CoA or literature).

Record all QC data in your laboratory notebook and retain the CoA with your experimental records for traceability and compliance purposes.

Review flag: Exact melting point, NMR chemical shift values, and HPLC purity specification are not provided in the source material; these should be obtained from the Aladdin CoA for SKU A690611 before inclusion in formal documentation.

Frequently asked questions

What solvents are recommended for dissolving 2-(Benzo[d]oxazol-2-ylthio)acetic acid?

Polar aprotic solvents such as DMSO and DMF are generally recommended as primary choices. Dissolution in dilute alkaline aqueous solutions (e.g., NaOH or Na₂CO₃) is also feasible due to the carboxylic acid group. Solubility in pure water or non-polar solvents is expected to be low; verify exact solubility data from the product SDS or TDS.

How should 2-(Benzo[d]oxazol-2-ylthio)acetic acid (A690611) be stored to maintain stability?

The compound should be stored in a tightly sealed container under cool, dry, and dark conditions, away from moisture, strong oxidisers, and strong bases. Refrigeration at 2–8 °C is typically recommended unless the product label specifies otherwise. Prepared stock solutions should be aliquoted and stored at −20 °C under inert atmosphere for longer-term stability.

What are the main synthetic applications of 2-(Benzo[d]oxazol-2-ylthio)acetic acid?

This compound serves as a versatile synthetic intermediate primarily for amide bond formation via coupling with amines, esterification with alcohols, and further elaboration of the benzoxazole heterocyclic core. It may also be useful in coordination chemistry as a bidentate ligand precursor due to its sulfur and carboxylate donor atoms.

Is the benzo[d]oxazole ring system stable under aqueous reaction conditions?

The benzo[d]oxazole ring system can be susceptible to hydrolysis under strongly acidic or strongly basic aqueous conditions. For reactions carried out in aqueous media, it is advisable to work near neutral pH and at mild temperatures to preserve ring integrity. Always monitor reaction progress by TLC or HPLC to detect any degradation.

Where can I find the Certificate of Analysis (CoA) for Aladdin SKU A690611?

The Certificate of Analysis for 2-(Benzo[d]oxazol-2-ylthio)acetic acid (SKU A690611) is available through the Aladdin Scientific website product page or by contacting Aladdin customer service directly. The CoA provides lot-specific data including purity, melting point, and spectral confirmation.

References

1. Aladdin Scientific. Product page: 2-(Benzo[d]oxazol-2-ylthio)acetic acid, SKU A690611. Aladdin Scientific Co., Ltd.
2. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. 5th ed. Wiley-Interscience. General reference for carboxylic acid coupling and esterification chemistry.
3. Pozharskii, A. F.; Soldatenkov, A. T.; Katritzky, A. R. Heterocycles in Life and Society. Wiley. General reference for benzoxazole heterocycle chemistry and stability.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.