1-Methyl-3-(thiophen-2-yl)-1H-pyrazol-5-amine

This aminopyrazole-thiophene hybrid melts in the range of 137-140°C.It exhibits solubility in a wide range of solvents,from polar protic(methanol)to aromatic(toluene),due to its balanced polarity from the amine and the heteroaromatic rings.The compound is stable under standard conditions but its primary amine group necessitates protection from strong electrophiles and oxidizing agents.Refrigerated,light-protected storage is advised for long-term stability.

1-Methyl-3-thiophen-2-ylpyrazol-5-amine is a biheteroaromatic scaffold of considerable interest.It combines electron-rich thiophene and pyrazole rings,linked directly,which allows for extendedπ-conjugation.The primary amine at the 5-position of the pyrazole is a highly versatile handle for condensation,acylation,and cyclization reactions.This structure serves as a minimalist model for donor-acceptor systems and a versatile precursor for more elaborate heterocyclic arrays.

1.Pharmaceutical Synthesis
A key intermediate for antimalarial and anticancer agents.The thiophene-pyrazole core is found in compounds targeting parasite dihydroorotate dehydrogenase(DHODH)and human kinase targets.The amine allows rapid generation of amide and sulfonamide libraries for structure-activity relationship(SAR)studies.

2.Agrochemical R&D
Used in developing insecticidal and fungicidal agents.The molecule's structure mimics natural heterocyclic allelochemicals.Derivatization of the amine can produce compounds that interfere with chitin biosynthesis in insects or ergosterol synthesis in fungi.

3.Functional Material Synthesis
Employed as a building block for organic semiconductors and dyes.Its donor-acceptor character(thiophene as donor,pyrazole as weak acceptor)and small band gap make it suitable for creating low-band-gap conjugated polymers or small molecules for organic field-effect transistors(OFETs)and dye-sensitized solar cells(DSSCs).

4.Organic Synthesis Building Block
A fundamental starting material for the synthesis of annulated heterocycles like thieno[2,3-c]pyrazoles via intramolecular cyclization of a functionalized amine.It is also used in multi-component reactions to generate complex molecular diversity from a simple,readily available core.