Description

6-Chloro-5-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 key synthetic intermediate for developing novel active pharmaceutical ingredients (APIs) and agrochemicals, offering a versatile scaffold for molecular diversification. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and specialty chemical industries for creating new compounds with targeted biological activities.

Application

• Pharmaceutical Intermediate: Serves as a critical precursor in the synthesis of kinase inhibitors and other small-molecule drug candidates targeting various therapeutic areas.
• Agrochemical Research: Used as a building block for developing new herbicides, fungicides, and insecticides with novel modes of action.
• Chemical Biology Probe Development: Employed in medicinal chemistry to create molecular probes for studying enzyme function and biological pathways.
• Material Science Research: Investigated as a monomer or precursor for constructing organic electronic materials and advanced polymers.
• Contract Research & Manufacturing (CRO/CMO): Supplied to service organizations for custom synthesis and process scale-up projects.
• Academic Research: Utilized in university and institutional labs for methodology development and heterocyclic chemistry studies.

Basic Information

Product Name	6-Chloro-5-Methylthieno[2,3-D]Pyrimidin-4(3H)-One
CAS No.	56844-42-9
Molecular Formula	C7H5ClN2OS
Molecular Weight	200.64 g/mol
Synonyms	6-Chloro-5-methyl-3,4-dihydrothieno[2,3-d]pyrimidin-4-one; 6-Chloro-5-methyl-4H-thieno[2,3-d]pyrimidin-4-one; 4(3H)-Thieno[2,3-d]pyrimidinone, 6-chloro-5-methyl-; 6-Chloro-5-methylthieno[2,3-d]pyrimidin-4-ol; 56844-42-9 (CAS); Thienopyrimidinone derivative
EINECS	Contact for details

Quality Control

Our 6-Chloro-5-Methylthieno[2,3-D]Pyrimidin-4(3H)-One is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and NMR/LC-MS for identity confirmation, to ensure it meets the high standards required for research and development. Certificates of Analysis (COA) with complete analytical data are provided for every shipment, ensuring full traceability and compliance with your project specifications.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (HPLC)	Conforms
Identification (IR)	Conforms
Purity (HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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