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• Solvents and Organic Chemicals Organic Compounds Organic oxygen compounds Organooxygen compounds Carbonyl compounds Aldehydes

Introduction to 3-ethynylthiophene-2-carbaldehyde (CAS No: 221103-69-1)

3-ethynylthiophene-2-carbaldehyde, identified by the Chemical Abstracts Service Number (CAS No) 221103-69-1, is a versatile organic compound that has garnered significant attention in the field of pharmaceutical chemistry and materials science. This heterocyclic aldehyde features a thiophene core substituted with an ethynyl group at the 3-position and a formyl group at the 2-position, making it a valuable intermediate in the synthesis of complex molecules.

The molecular structure of 3-ethynylthiophene-2-carbaldehyde consists of a five-membered aromatic ring containing sulfur, which is a key feature of thiophene derivatives. The presence of both an ethynyl (-C≡CH) and a formyl (-CHO) functional group provides multiple reactive sites for further chemical modification. This dual reactivity has made it a popular building block in the development of pharmaceuticals, agrochemicals, and advanced materials.

In recent years, 3-ethynylthiophene-2-carbaldehyde has been extensively studied for its potential applications in medicinal chemistry. Its unique structural motifs have been leveraged in the design of novel bioactive compounds. For instance, researchers have explored its use in synthesizing small-molecule inhibitors targeting various biological pathways. One notable area of research involves its incorporation into kinase inhibitors, which are critical in treating cancers and inflammatory diseases. The aldehyde group can undergo condensation reactions with amines or hydrazines to form Schiff bases or hydrazones, respectively, which have shown promising antitumor and anti-inflammatory properties.

Moreover, the ethynyl group in 3-ethynylthiophene-2-carbaldehyde allows for further functionalization via cross-coupling reactions such as Suzuki-Miyaura or Sonogashira couplings. These reactions are pivotal in constructing biaryl structures, which are prevalent in many biologically active molecules. For example, recent studies have demonstrated the synthesis of thiophene-based anticancer agents by coupling 3-ethynylthiophene-2-carbaldehyde with boronic acids or halogenated aryl compounds. Such methodologies highlight its utility as a precursor in drug discovery pipelines.

The compound has also found applications in materials science, particularly in the development of organic semiconductors and conductive polymers. The thiophene ring is a well-known component in conjugated polymers due to its ability to facilitate electron delocalization, enhancing charge transport properties. By incorporating 3-ethynylthiophene-2-carbaldehyde into polymer backbones or as a monomer unit, researchers have achieved materials with improved electrical conductivity and optical properties. These advancements are particularly relevant in the field of organic electronics, where efficient charge transport is essential for devices such as organic light-emitting diodes (OLEDs) and solar cells.

From a synthetic chemistry perspective, 3-ethynylthiophene-2-carbaldehyde serves as a crucial intermediate for constructing more complex scaffolds. The formyl group can be reduced to an alcohol or converted into an ester, amide, or ketal depending on the desired outcome. This flexibility has enabled chemists to tailor the compound’s reactivity for specific synthetic targets. For example, it has been used in the preparation of thioether derivatives through nucleophilic addition reactions, which are relevant in peptidomimetic chemistry and protease inhibition studies.

Recent advances in flow chemistry have also capitalized on the utility of 3-ethynylthiophene-2-carbaldehyde by enabling controlled and scalable synthesis under mild conditions. Continuous flow reactors provide advantages such as improved reaction efficiency, reduced byproduct formation, and enhanced reproducibility. These systems have been employed to produce derivatives of 3-ethynylthiophene-2-carbaldehyde with high purity and yield, facilitating their use in downstream applications.

The pharmacological potential of 3-ethynylthiophene-2-carbaldehyde continues to be explored through structure-activity relationship (SAR) studies. By systematically modifying its structure and evaluating biological activity, researchers aim to identify lead compounds with enhanced efficacy and reduced toxicity. For instance, modifications at the 3-position or introduction of additional substituents have been investigated for their impact on binding affinity to target proteins. Such efforts underscore the importance of this compound as a scaffold for drug development.

In conclusion,3-ethynylthiophene-2-carbaldehyde (CAS No: 221103-69-1) is a multifaceted compound with broad applications across pharmaceuticals and materials science. Its unique structural features enable diverse chemical transformations, making it indispensable in synthetic chemistry research. As advancements continue to emerge in drug discovery and material engineering,3-ethynylthiophene-2-carbaldehyde is poised to remain at the forefront of innovation.

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