In the vast landscape of chemical compounds, specific identifiers like CAS numbers are critical for clear communication and reliable sourcing. For 7-Nitroquinazolin-4(3H)-one, the CAS number is 20872-93-9. This unique identifier links to a compound that is highly valued in synthetic chemistry, particularly within the pharmaceutical and fine chemical industries. If your work involves advanced organic synthesis, understanding the details of this specific chemical entity is important for successful procurement and application.

What is 7-Nitroquinazolin-4(3H)-one (CAS 20872-93-9)?

7-Nitroquinazolin-4(3H)-one is a heterocyclic organic compound belonging to the quinazolinone family. Its structure is defined by a fused bicyclic system containing a pyrimidine ring fused to a benzene ring, with a nitro group (-NO2) attached at the 7th position of the ring system and a carbonyl group (=O) at the 4th position. The '3H' in its name indicates the position of a hydrogen atom within the tautomeric forms of the molecule. Its molecular formula is C8H5N3O3, with a molecular weight of approximately 191.14 g/mol. The typical appearance of this compound, as reported by manufacturers and suppliers, is a solid, often described as light yellow to brown, indicating a degree of purity that is suitable for many synthesis applications. Purity levels exceeding 98% are commonly sought after by researchers and formulators.

Why is it a Key Building Block?

The significance of 7-Nitroquinazolin-4(3H)-one (CAS 20872-93-9) in synthesis stems from its functional groups and heterocyclic core. The quinazolinone scaffold is a recognized pharmacophore, meaning it's a molecular framework that is present in many biologically active compounds. This makes it an excellent starting point for developing new pharmaceuticals. The nitro group is a versatile functional group that can be readily transformed:

  • Reduction to Amine: The nitro group can be reduced to an amino group (-NH2) using various reducing agents. Aminoquinazolines are common intermediates in the synthesis of drugs targeting a wide range of diseases.
  • Nucleophilic Aromatic Substitution: Depending on reaction conditions, the nitro group or other positions on the aromatic ring might be amenable to substitution reactions.
  • Further Ring Modifications: The existing functionalities can be used to build more complex fused or substituted ring systems.

Sourcing and Purchasing Considerations

When you need to buy 7-Nitroquinazolin-4(3H)-one, understanding its CAS number is the first step in a successful search. Reputable chemical suppliers and manufacturers will list this identifier prominently. For example, companies that manufacture or supply fine chemicals and pharmaceutical intermediates will have this compound in their catalog. When you make an inquiry, always specify the CAS number to ensure you are referencing the correct compound. Look for suppliers who provide detailed product specifications, including purity, appearance, and molecular data, along with safety data sheets (SDS). Purchasing from manufacturers, particularly those in China, can often offer cost benefits and assured quality for bulk orders, making it a strategic choice for any research or production facility.

In summary, 7-Nitroquinazolin-4(3H)-one (CAS 20872-93-9) is a valuable intermediate due to its chemical structure and reactive potential. As a key building block for advanced synthesis, it plays an important role in drug discovery and the development of new materials. By knowing its CAS number and associated properties, you are well-equipped to find reliable sources and integrate it effectively into your chemical projects.