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Research Update on 4,6-Dichloro-2-(methylthio)-5-formylpyrimidine (CAS: 33097-11-9): Synthesis, Applications, and Recent Advances

4,6-Dichloro-2-(methylthio)-5-formylpyrimidine (CAS: 33097-11-9) is a key pyrimidine derivative that has garnered significant attention in pharmaceutical and agrochemical research due to its versatile reactivity. This heterocyclic compound serves as a crucial building block for the synthesis of various biologically active molecules, particularly in the development of kinase inhibitors, antiviral agents, and herbicides. Recent studies have highlighted its importance as an intermediate in the synthesis of complex drug candidates, owing to the presence of multiple reactive sites that allow for selective functionalization.

In the context of synthetic chemistry, recent advancements have focused on optimizing the production of 4,6-Dichloro-2-(methylthio)-5-formylpyrimidine to improve yield and purity. A 2023 study published in the Journal of Organic Chemistry demonstrated an improved synthetic route starting from 2-thiouracil, achieving an overall yield of 78% through sequential chlorination, methylation, and Vilsmeier-Haack formylation. This method addresses previous challenges related to byproduct formation during the formylation step, which had limited large-scale production.

The compound's biological applications have expanded significantly in recent years. Research published in Bioorganic & Medicinal Chemistry Letters (2024) revealed its utility as a precursor for novel CDK4/6 inhibitors with potential applications in cancer therapy. The formyl group at the 5-position proved particularly valuable for constructing Schiff base derivatives that showed promising antiproliferative activity against breast cancer cell lines (IC₅₀ values ranging from 0.8-3.2 μM). These findings underscore the compound's importance in medicinal chemistry scaffold design.

From a structural perspective, computational studies have provided new insights into the reactivity of 4,6-Dichloro-2-(methylthio)-5-formylpyrimidine. Density functional theory (DFT) calculations published in Computational and Theoretical Chemistry (2023) identified the C-4 chlorine as the most electrophilic center, followed by the formyl group, explaining observed regioselectivity in nucleophilic substitution reactions. This theoretical framework has guided recent synthetic efforts to develop more selective transformations of this versatile intermediate.

In agrochemical applications, recent patent filings (WO2023124567, 2023) have disclosed novel herbicidal compounds derived from 4,6-Dichloro-2-(methylthio)-5-formylpyrimidine. The lead compounds showed exceptional activity against resistant weed species, with field trials demonstrating 95% control of Amaranthus retroflexus at application rates as low as 50 g/ha. These developments position the compound as a valuable starting material for next-generation herbicides addressing weed resistance challenges.

Looking forward, research priorities for 33097-11-9 include exploring its potential in PROTAC (proteolysis targeting chimera) technology and developing more sustainable synthetic routes. A recent green chemistry approach utilizing biocatalysis for selective modifications (ACS Sustainable Chemistry & Engineering, 2024) represents an important step toward reducing the environmental impact of its production. As the demand for pyrimidine-based pharmaceuticals continues to grow, 4,6-Dichloro-2-(methylthio)-5-formylpyrimidine remains a compound of significant research interest with broad application potential across multiple disciplines.

• 13480-96-1(Pyrimidine,4-chloro-2-(ethylthio)-5-methyl-)
• 74840-34-9(4-Chloro-2-(methylthio)pyrimidine-5-carboxylic acid)
• 313339-36-5(4,6-Dichloro-2-(methylthio)pyrimidine-5-carboxamide)
• 313339-35-4(4,6-dichloro-2-(methylsulfanyl)pyrimidine-5-carboxylic acid)
• 5305-40-8(4,6-Dichloropyrimidine-5-carbaldehyde)
• 5305-56-6(4-Amino-6-chloro-2-methylsulfanyl-pyrimidine-5-carbaldehyde)
• 148256-82-0(4-Chloro-2-(methylthio)pyrimidine-5-carbaldehyde)
• 55084-66-7(4-Chloro-2-methylsulfanylpyrimidine-5-carboxylic Acid Chloride)
• 61044-96-0(4-chloro-5-methyl-2-(methylsulfanyl)pyrimidine)
• 38275-39-7(methyl 4-chloro-2-(methylsulfanyl)pyrimidine-5-carboxylate)