1-(2-Methoxy-5-methylphenyl)thiourea: Properties & Applications

1-(2-Methoxy-5-methylphenyl)thiourea is an aryl-substituted thiourea compound of interest in organic synthesis and medicinal chemistry as a versatile building block for heterocyclic scaffolds and bioactive molecule development.

IUPAC Name

1-(2-methoxy-5-methylphenyl)thiourea

Compound Class

Aryl thiourea derivative

Key Functional Groups

Thiourea (-NH-C(=S)-NH2), methoxy (-OCH3), methyl (-CH3)

Primary Research Use

Intermediate in heterocyclic synthesis and medicinal chemistry

Supplier SKU

N698906 (Aladdin Scientific)

Storage Recommendation

Store in a cool, dry place away from light and moisture

Chemical Structure and Physical Properties

1-(2-Methoxy-5-methylphenyl)thiourea belongs to the class of monosubstituted aryl thioureas. Its molecular structure consists of a thiourea core (-NH-C(=S)-NH₂) attached to an aromatic ring bearing an ortho-methoxy group and a para-methyl group relative to the thiourea nitrogen. This substitution pattern imparts distinct steric and electronic properties: the ortho-methoxy group introduces steric hindrance around the N–Ar bond and donates electron density into the ring through resonance, while the para-methyl group further modulates the electron density of the aromatic system.

These electronic effects influence both the reactivity of the thiourea nitrogen atoms and the compound's intermolecular interactions, including hydrogen-bonding capacity—a characteristic that is central to the chemistry of thiourea derivatives. The compound is expected to appear as a white to off-white crystalline solid, consistent with the general physical appearance of aryl thioureas.

Synthesis and Preparation Context

Aryl thioureas such as 1-(2-Methoxy-5-methylphenyl)thiourea are typically prepared by reacting the corresponding aryl amine—in this case 2-methoxy-5-methylaniline—with ammonium thiocyanate or thiocyanic acid under mildly acidic conditions, or alternatively by direct treatment of the amine with thiocarbamoyl chloride or by condensation with carbon disulfide followed by ammonolysis.

The reaction of 2-methoxy-5-methylaniline with ammonium thiocyanate in aqueous acid is a straightforward one-pot procedure that has historically been used to prepare a wide variety of aryl thioureas. Product isolation typically involves precipitation upon cooling or neutralization of the reaction mixture, followed by recrystallization to afford the analytically pure compound.

Researchers requiring this compound for downstream synthetic work can procure it as a ready-made reagent (SKU: N698906) from Aladdin Scientific, avoiding the need for in-house preparation and purity verification.

Research Applications in Heterocyclic and Medicinal Chemistry

Aryl thioureas are important synthetic intermediates in heterocyclic chemistry. 1-(2-Methoxy-5-methylphenyl)thiourea can serve as a precursor to a range of nitrogen- and sulfur-containing heterocycles. Cyclization reactions of aryl thioureas with electrophilic partners—such as alpha-haloketones, alpha-halocarboxylic acids, or activated alkenes—give access to aminothiazoles, thiazolidinones, benzothiazinones, and related ring systems, many of which exhibit significant biological activity.

The methoxy and methyl substituents on the aryl ring of this particular compound provide handles for further functionalization and may influence the biological profile of derived molecules through modulation of lipophilicity, metabolic stability, and target binding. Medicinal chemists frequently employ differentially substituted aryl thioureas in structure–activity relationship (SAR) studies to optimize potency and selectivity of drug candidates targeting enzymes, ion channels, and receptors.

Beyond cyclization, thioureas themselves act as ligands in coordination chemistry, as organocatalysts for asymmetric reactions via hydrogen-bond activation, and as anion-binding receptors in supramolecular chemistry, broadening the utility of compounds such as 1-(2-Methoxy-5-methylphenyl)thiourea across multiple research disciplines.

Handling, Safety, and Storage Guidelines

As with most organic thiourea derivatives, 1-(2-Methoxy-5-methylphenyl)thiourea should be handled with standard laboratory precautions. Personnel should wear appropriate personal protective equipment (PPE) including nitrile gloves, safety glasses, and a laboratory coat when handling this compound. Work should be conducted in a well-ventilated environment or fume hood to minimize inhalation of dust or aerosols.

The compound should be stored in a tightly sealed container in a cool, dry place, protected from light and moisture to prevent degradation. Compatibility with strong oxidizing agents and strong acids should be assessed prior to use in novel reaction conditions. Consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for complete hazard information, first-aid measures, and disposal guidance specific to this reagent.

Researchers should verify the purity and identity of the compound upon receipt using techniques such as melting point determination, thin-layer chromatography (TLC), NMR spectroscopy, or HPLC as appropriate for their application.

Frequently asked questions

What is 1-(2-Methoxy-5-methylphenyl)thiourea used for in research?

This compound is primarily used as a synthetic intermediate in heterocyclic chemistry, enabling the construction of thiazole, thiazolidinone, and related ring systems through cyclization reactions. It is also explored as a building block in medicinal chemistry SAR studies and as a scaffold in supramolecular and organocatalysis research.

How should 1-(2-Methoxy-5-methylphenyl)thiourea be stored to maintain stability?

The compound should be stored in a tightly sealed container in a cool, dry location, away from light and moisture. These precautions help prevent hydrolysis or oxidative degradation of the thiourea functional group over time.

How is 1-(2-Methoxy-5-methylphenyl)thiourea typically synthesized?

It is typically prepared by reacting 2-methoxy-5-methylaniline with ammonium thiocyanate under mildly acidic aqueous conditions in a one-pot procedure. The product is then isolated by precipitation and purified by recrystallization. Alternatively, researchers can purchase the ready-made reagent (SKU: N698906) from Aladdin Scientific.

What safety precautions are required when handling this compound?

Standard laboratory PPE—including nitrile gloves, safety glasses, and a lab coat—should be worn. Handling should be performed in a well-ventilated area or fume hood. The full Safety Data Sheet (SDS) from Aladdin Scientific should be consulted for complete hazard and disposal information.

Which Aladdin Scientific SKU corresponds to 1-(2-Methoxy-5-methylphenyl)thiourea?

1-(2-Methoxy-5-methylphenyl)thiourea is available from Aladdin Scientific under SKU N698906.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. Wiley-Interscience. General reference for thiourea synthesis methods.
2. Kaur, R. et al. Thiourea derivatives in medicinal chemistry: a review of their biological activities. General literature review on aryl thiourea pharmacology.
3. Doyle, A.G.; Jacobsen, E.N. Small-molecule H-bond donors in asymmetric catalysis. Chem. Rev. 2007, 107, 5713–5743. doi:10.1021/cr068373r

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