Description

4-Aminothieno[2,3-D]Pyrimidin-2(1H)-One is a high-value heterocyclic building block and key synthetic intermediate in advanced organic chemistry. This compound is critical for researchers and manufacturers developing novel active pharmaceutical ingredients (APIs) and agrochemicals due to its fused thienopyrimidine core. It is primarily utilized by pharmaceutical R&D teams, agrochemical innovators, and specialty chemical synthesis laboratories seeking to create new molecules with targeted biological activity.

Application

• Pharmaceutical Intermediate: Serves as a crucial precursor in the synthesis of kinase inhibitors and other small-molecule drug candidates targeting various disease pathways.
• 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 for creating tool compounds to study enzyme function and biological pathways.
• Material Science Research: Investigated as a component for constructing organic electronic materials and advanced polymers due to its electron-rich heterocyclic structure.
• Custom Synthesis & Contract Manufacturing: Supplied to CDMOs (Contract Development and Manufacturing Organizations) for the production of client-specific target molecules.

Basic Information

Product Name	4-Aminothieno[2,3-D]Pyrimidin-2(1H)-One
CAS No.	75860-78-5
Molecular Formula	C6H5N3OS
Molecular Weight	167.19 g/mol
Synonyms	4-Aminothieno[2,3-d]pyrimidin-2(1H)-one; 2H-Thieno[2,3-d]pyrimidine-2-one, 4-amino-; 4-Amino-1H-thieno[2,3-d]pyrimidin-2-one; 4-Amino-2-hydroxy-thieno[2,3-d]pyrimidine; 4-Aminothienopyrimidinone; ATPO; Thieno[2,3-d]pyrimidin-2(1H)-one, 4-amino-
EINECS	Contact for details

Quality Control

Our production of 4-Aminothieno[2,3-D]Pyrimidin-2(1H)-One adheres to stringent internal quality standards to ensure batch-to-batch consistency and high purity for research and development applications. Each lot is supported by a comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles. We implement rigorous analytical controls, including HPLC, NMR, and mass spectrometry, to verify product integrity and meet the exacting requirements of our global B2B clients.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (typically 15-25°C). Keep the container sealed to protect this light-sensitive material from degradation.

Specification

Item	Specification
Appearance	Off-white to light yellow powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.5%
Heavy Metals	≤ 20 ppm

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