Description

2H-Pyrimido[4,5-D][1,3]Oxazine (9Ci) is a specialized heterocyclic organic compound with the CAS registry number 51473-21-3, serving as a crucial advanced intermediate in modern synthetic chemistry. Its fused pyrimidine-oxazine structure makes it a valuable building block for constructing complex molecular architectures, particularly in pharmaceutical research and development. This high-purity intermediate is essential for medicinal chemists and process development scientists working on novel active pharmaceutical ingredients (APIs) and other fine chemicals.

Application

• Pharmaceutical Intermediate: A key synthetic precursor in the research and development of novel drug candidates, particularly for central nervous system (CNS) and antiviral therapies.
• Agrochemical Synthesis: Used in the development of advanced pesticides and herbicides, leveraging its heterocyclic core for biological activity.
• Material Science Research: Serves as a monomer or precursor for designing novel organic electronic materials and specialty polymers.
• Academic & R&D Laboratories: Employed in methodological studies and as a model compound for heterocyclic chemistry and reaction mechanism investigations.
• Ligand and Catalyst Development: Its structure can be functionalized to create novel chelating ligands for catalytic systems.

Basic Information

Product Name	2H-Pyrimido[4,5-D][1,3]Oxazine (9Ci)
CAS No.	51473-21-3
Molecular Formula	C6H4N4O
Molecular Weight	148.12 g/mol
Synonyms	2H-Pyrimido[4,5-d][1,3]oxazine; 2H-Pyrimido[4,5-d]-1,3-oxazine; Pyrimido[4,5-d][1,3]oxazine, 2H-; 51473-21-3; 2H-Pyrimido(4,5-d)pyrimidine-2,4(1H,3H)-dione? (common mis-association check); Fused pyrimidine oxazine; Heterocyclic building block 51473-21-3
EINECS	Contact for details

Quality Control

Our 2H-Pyrimido[4,5-D][1,3]Oxazine (9Ci) is manufactured under strict quality management systems. Each 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 process chemistry. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and consistency.

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 the container tightly sealed in a dry environment to minimize exposure to moisture. For long-term storage, consider inert atmosphere conditions.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.5%
Single Unknown Impurity (HPLC)	≤ 1.0%
Total Impurities (HPLC)	≤ 3.0%

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