methyl 7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylate CAS 2091582-11-3
| CAS No. | 2091582-11-3 |
| Molecular Formula | C9H9BrN4O2 |
| Molecular Weight | 285.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
methyl 7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylate (CAS 2091582-11-3), molecular formula C9H9BrN4O2 and molecular weight 285.10 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution, methyl 7-bromo-5-ethyl-1H-pyrazolo[4,3-d]pyrimidine-3-carboxylate is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 285.10 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
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 | C9H9BrN4O2 |
| Molecular Weight | 285.10 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1997 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 4 |
Related methyl Standards
- 1-((4-Bromo-1h-pyrazol-1-yl)methyl)-1h-pyrazole-3-carbohydrazide (CAS 1002243-76-6)
- Methyl 1-((4-bromo-1h-pyrazol-1-yl)methyl)-1h-pyrazole-3-carboxylate (CAS 1003988-72-4)
- 5-Bromo-N-methoxy-N-methyl-1H-pyrazolo[3,4-b]pyridine-3-carboxamide (CAS 1314734-57-0)
- 4-Bromo-1-isopentyl-3-(trifluoromethyl)-1H-pyrazole (CAS 1845690-56-3)
- 5-[(4-Bromo-1H-pyrazol-1-yl)methyl]-2-furohydrazide (CAS 402729-65-1)
- 2-(2-Bromo-5-fluorophenoxy)-3-(dimethylamino)acrylonitrile (CAS 1620478-72-9)
- 4-Bromo-1-fluoro-5-(methoxymethoxy)naphthalene (CAS 1629341-61-2)
- 3-Bromo-4-fluoro-1-(4-methoxybenzyl)-1H-pyrazole (CAS 1845722-88-4)
Recommended Standards
- Methyl 4-amino-5-bromo-2-methylpyrrolo[2,1-f][1,2,4]triazine-7-carboxylate (CAS 2090690-20-1)
- Furosemide Impurity 44 (CAS CATO-C4X-140244)
- Ethyl 4-amino-5-bromopyrrolo[2,1-f][1,2,4]triazine-7-carboxylate (CAS 2091742-74-2)
- Ibandronic Impurity 6 (CAS 63132-39-8)
- 2,3-Difluoro-5-(trifluoromethyl)benzodifluoride (CAS 1807176-95-9)
- 7,8-Dehydrorutecarpine (CAS 55786-24-8)
- 6,7,8,9-Tetrahydro-3-methoxy-5H-benzocyclohepten-5-ol (CAS 124573-34-8)
- 4-Bromo-3-thiophenecarboxylic acid (CAS 16694-17-0)
- Imidazo[1,2-a]pyridine-6-carbohydrazide (CAS 886361-97-3)
- (2S,4S)-tert-butyl 4-(acetylthio)-2-((tert-butoxycarbonyl(sulfamoyl)amino)methyl)pyrrolidine-1-carboxylate (CAS 148017-43-0)
- N,N-Dimethyl-4-(4-phenylpiperazin-1-yl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-2-amine (CAS 1015856-19-5)
- 2-((2,5-Dichlorophenyl)sulfonyl)propanehydrazide (CAS 1797296-60-6)
- rac-(3R,4R)-2-[(4-fluorophenyl)methyl]-3-(4-methoxyphenyl)-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid (CAS 1050503-93-9)
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