Description

3-Methylthieno[2,3-D]Pyrimidin-4(3H)-One is a high-purity heterocyclic building block of significant interest in advanced organic synthesis. This compound matters as a versatile and critical intermediate for constructing complex molecular architectures, particularly in pharmaceutical research and development. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and material science industries seeking to develop new active ingredients and functional molecules.

Application

• Pharmaceutical Intermediate: A key synthon in the research and synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders, oncology, and anti-infective therapies.
• Agrochemical Research: Used in the development of new herbicides, fungicides, and insecticides, leveraging its heterocyclic core for bioactivity.
• Material Science Precursor: Serves as a building block for organic electronic materials, such as organic semiconductors and light-emitting diodes (OLEDs).
• Chemical Biology Probe: Utilized in the design and synthesis of molecular probes for studying enzyme function and biological pathways.
• Custom Synthesis & Contract Manufacturing: Supplied to CDMOs (Contract Development and Manufacturing Organizations) for the production of bespoke compounds and scaled-up processes.
• Academic & Institutional Research: A valuable reagent for universities and research institutes conducting fundamental studies in heterocyclic and medicinal chemistry.

Basic Information

Product Name	3-Methylthieno[2,3-D]Pyrimidin-4(3H)-One
CAS No.	18740-31-3
Molecular Formula	C7H6N2OS
Molecular Weight	166.20 g/mol
Synonyms	3-Methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine; 3-Methylthieno[2,3-d]pyrimidin-4(3H)-one; 3-Methyl-3H-thieno[2,3-d]pyrimidin-4-one; 4(3H)-Thieno[2,3-d]pyrimidinone, 3-methyl-; Thieno[2,3-d]pyrimidin-4(3H)-one, 3-methyl-; 18740-31-3; 3-Methyl-4H-thieno[2,3-d]pyrimidin-4-one
EINECS	Contact for details

Quality Control

Our 3-Methylthieno[2,3-D]Pyrimidin-4(3H)-One is produced under strict quality management systems to ensure batch-to-batch consistency and high purity for research and development applications. All products undergo rigorous analytical testing, including HPLC, NMR, and mass spectrometry, to confirm identity and purity. Certificates of Analysis (COA) detailing all specifications are available upon request to support your quality assurance and regulatory documentation needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Keep away from incompatible materials. For long-term storage, consider storage under an inert atmosphere to maintain optimal stability.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Melting Point	Contact for details
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.