Ethyl 7-hydroxy-5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate CAS 90349-67-0
| CAS No. | 90349-67-0 |
| Molecular Formula | C9H9N3O4 |
| Molecular Weight | 223.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Ethyl 7-hydroxy-5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate.
Ethyl 7-hydroxy-5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate (CAS 90349-67-0) is a high-purity analytical reference standard with the molecular formula C9H9N3O4 and a molecular weight of 223.19 g/mol.
The molecular framework of Ethyl 7-hydroxy-5-oxo-4,5-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate (C9H9N3O4) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C9H9N3O4 |
| Molecular Weight | 223.19 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
| Nitrogen Atoms | 3 |
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Recommended Standards
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- Methyl (S)-2-amino-2-(3-(trifluoromethyl)bicyclo[1.1.1]Pentan-1-yl)acetate (CAS 914082-70-5)
- (2-aminopropoxy)benzene hydrochloride (CAS 1519-94-4)
- methyl 2-[(3S)-pyrrolidin-3-yl]acetate;hydrochloride (CAS 1024038-33-2)
- 1-(5-Bromo-2-(2,2,2-trifluoroethoxy)phenyl)ethan-1-amine (CAS 1250558-42-9)
- 1-((5-Bromo-2-methoxyphenyl)sulfonyl)piperidin-4-ol (CAS 1023242-77-4)
- 3-Benzyl-2,4-dioxo-1,2,3,4-tetrahydroquinazoline-7-carboxylic acid (CAS 687580-04-7)
- Benzyl N-(2-fluoro-4-hydroxyphenyl)carbamate (CAS 1195781-24-8)
- 4-Methyl-3-(thiophene-2-carboxamido)benzoic acid (CAS 313260-44-5)
- tert-Butyl (5-bromofuran-2-yl)carbamate (CAS 1239721-51-7)
- (4-Iodo-3-methylisoxazol-5-yl)acetic acid methyl ester (CAS 1356600-44-6)
- Peptide 441 (CAS CATO-CPTD788441)
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