N-benzyl-7-chloro-2-methyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxamide CAS 338778-91-9
| CAS No. | 338778-91-9 |
| Molecular Formula | C21H15ClN2O3 |
| Molecular Weight | 378.81 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
N-benzyl-7-chloro-2-methyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxamide (CAS 338778-91-9) is a high-purity analytical reference standard with the molecular formula C21H15ClN2O3 and a molecular weight of 378.81 g/mol.
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, N-benzyl-7-chloro-2-methyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxamide is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 378.81 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.
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 | C21H15ClN2O3 |
| Molecular Weight | 378.81 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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) | 15.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Recommended Standards
- N-(4-chlorophenyl)-2,7-dimethyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxamide (CAS 338751-37-4)
- Avanafil Impurity 52 (CAS CATO-C4X-111852)
- N-(4-chlorobenzyl)-2-methyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxamide (CAS 338417-61-1)
- Fezolinetant Impurity 6 (CAS 2759134-53-5)
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