Description

5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxamide 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), particularly in therapeutic areas requiring complex molecular architectures. Pharmaceutical R&D teams and fine chemical manufacturers need this material for constructing thienopyrimidine-based compounds, which are core scaffolds in medicinal chemistry for their diverse biological activities.

Application

• Pharmaceutical Intermediate: Serves as a critical precursor in the synthesis of novel drug candidates targeting various disease pathways.
• Medicinal Chemistry Research: Used as a versatile building block for constructing libraries of thienopyrimidine derivatives for biological screening and structure-activity relationship (SAR) studies.
• Agrochemical Development: Employed in the research and synthesis of new crop protection agents and pesticides.
• Material Science: Potential use in the development of organic electronic materials and specialty polymers.
• Contract Research & Manufacturing (CRO/CMO): Supplied to organizations specializing in custom synthesis and process development for the life sciences industry.

Basic Information

Product Name	5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxamide
CAS No.	691862-37-0
Molecular Formula	C8H7N3O2S
Molecular Weight	209.22 g/mol
Synonyms	5-Methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxamide; Thieno[2,3-d]pyrimidine-6-carboxamide, 5-methyl-3,4-dihydro-4-oxo-; 6-Carbamoyl-5-methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine; 5-Methyl-4-oxo-4H-thieno[2,3-d]pyrimidine-6-carboxylic acid amide; CAS 691862-37-0
EINECS	Contact for details

Quality Control

Our 5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxamide is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for research and development applications. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with each shipment and is available upon request.

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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which may affect stability and handling properties.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.5%

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