Description

5-Methyl-4-Oxo-3,4-Dihydro-Thieno[2,3-D]Pyrimidine-6-Carboxylic Acid is a high-purity heterocyclic building block of significant importance in advanced organic synthesis. This compound serves as a critical intermediate for the development of novel active pharmaceutical ingredients (APIs) and agrochemicals, enabling the creation of complex molecular architectures. It is primarily sought after by research institutions and manufacturers in the pharmaceutical, agrochemical, and fine chemical industries for its role in constructing fused thienopyrimidine scaffolds.

Application

• Pharmaceutical Intermediate: A key synthon for the research and development of novel drug candidates, particularly in kinase inhibitor and antiviral therapeutic areas.
• Agrochemical Synthesis: Used in the production of advanced herbicides, fungicides, and insecticides that require specific heterocyclic cores for bioactivity.
• Organic Light-Emitting Diode (OLED) Materials: Serves as a precursor for electron-transport or host materials in electronic applications due to its fused ring structure.
• Chemical Research & Development: Employed in academic and industrial R&D labs for method development and exploring new chemical spaces in heterocyclic chemistry.
• Ligand Synthesis for Catalysis: Can be utilized to create novel ligands for transition metal catalysis, enhancing reaction selectivity and efficiency.

Basic Information

Item	Detail
Product Name	5-Methyl-4-Oxo-3,4-Dihydro-Thieno[2,3-D]Pyrimidine-6-Carboxylic Acid
CAS No.	101667-97-4
Molecular Formula	C8H6N2O3S
Molecular Weight	210.21 g/mol
Synonyms	5-Methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid; Thieno[2,3-d]pyrimidine-6-carboxylic acid, 3,4-dihydro-5-methyl-4-oxo-; 101667-97-4; 5-Methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid; 6-Carboxy-5-methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine
EINECS	Contact for details

Quality Control

Our 5-Methyl-4-Oxo-3,4-Dihydro-Thieno[2,3-D]Pyrimidine-6-Carboxylic Acid is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing, including HPLC for purity and NMR/IR for structural confirmation, to ensure it meets the high standards required for research and production. Certificates of Analysis (COA) detailing batch-specific results are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep the container tightly sealed when not in use to protect from moisture. Due to its chemical nature, store away from strong acids and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.