Phthaloyl Amlodipine, also referred to as Phthalimidoamlodipine, is a specialized pharmaceutical intermediate associated with the manufacturing and analytical characterization of Amlodipine. It is a protected intermediate containing the characteristic 1,4-dihydropyridine nucleus found in Amlodipine, together with a phthalimide-protected aminoethyl side chain.
Phthaloyl Amlodipine is identified by CAS No. 88150-62-3, with a molecular formula of C28H27ClN2O7 and a molecular weight of 538.98 g/mol. It is primarily relevant to pharmaceutical process chemistry, Amlodipine intermediate manufacturing, impurity characterization and analytical research.
Unlike Amlodipine or Amlodipine Besylate, Phthaloyl Amlodipine is generally used as an intermediate or related compound, rather than as the final therapeutic active pharmaceutical ingredient. This distinction is important when establishing product specifications, quality documentation and regulatory descriptions.
Phthaloyl Amlodipine incorporates several functional groups within a single molecular structure, including a substituted 1,4-dihydropyridine ring, ester groups, a chlorophenyl group and a phthalimide moiety.
The phthalimide group functions as a protecting group for the aminoethyl functionality. This protection can facilitate selective chemical transformations during the synthesis of Amlodipine. Subsequent deprotection provides the amino functionality required in the final Amlodipine structure.
| Parameter | Details |
|---|---|
| Product Name | Phthaloyl Amlodipine |
| Alternative Name | Phthalimidoamlodipine |
| CAS Number | 88150-62-3 |
| Molecular Formula | C28H27ClN2O7 |
| Molecular Weight | 538.98 g/mol |
| Chemical Class | Dihydropyridine derivative |
| Product Category | Pharmaceutical Intermediate |
| Associated API | Amlodipine |
| Physical Form | Solid |
| Appearance | Pale yellow to light yellow solid |
| Melting Point | Approximately 140–145°C |
| Commercial HPLC Purity | >98.0% HPLC |
Phthaloyl Amlodipine is important in pharmaceutical manufacturing because it provides a protected form of an essential side chain used in the synthesis of Amlodipine.
Protecting-group chemistry is frequently used in pharmaceutical synthesis to control the reactivity of functional groups. In the case of Phthaloyl Amlodipine, the phthalimide functionality helps protect the amino group while other structural transformations take place.
After the required transformations are completed, the protecting group can be removed under suitable reaction conditions. This produces the corresponding amino-containing intermediate that can be further processed toward Amlodipine.
The use of a controlled intermediate can help pharmaceutical process developers optimize reaction selectivity, purification and batch reproducibility.
Amlodipine belongs to the dihydropyridine class of calcium-channel-blocking compounds. Phthaloyl Amlodipine is structurally related to Amlodipine and represents a protected form of the aminoethyl side chain.
The intermediate is therefore relevant to manufacturing routes in which the amino group is introduced or protected during the synthetic sequence.
From a process-development perspective, important considerations include:
These factors can influence the quality of the subsequent Amlodipine manufacturing stages.
Phthaloyl Amlodipine has applications primarily in pharmaceutical development and manufacturing.
Its principal application is as a synthetic intermediate for Amlodipine-related manufacturing processes.
Pharmaceutical research teams can use Phthaloyl Amlodipine during development and optimization of synthetic routes, reaction conditions and purification procedures.
Because Phthaloyl Amlodipine is associated with Amlodipine-related compounds, characterized material can be useful for impurity identification and chromatographic method development.
High-purity material may be used as a reference compound to investigate chromatographic peaks observed during analysis of Amlodipine intermediates or finished pharmaceutical products.
Quality control for Phthaloyl Amlodipine should reflect its intended use as a pharmaceutical intermediate or analytical reference material.
A suitable quality-control program may include:
The exact acceptance criteria should be defined according to the intended grade and validated manufacturing specification.
High-performance liquid chromatography (HPLC) is one of the most useful analytical techniques for assessing Phthaloyl Amlodipine purity.
HPLC can help determine:
Commercial analytical-grade Phthaloyl Amlodipine has been reported with >98.0% HPLC purity. This value is useful as a commercial purity reference, but it should not be incorrectly described as a universal pharmacopoeial release assay.
For regulated pharmaceutical applications, the final HPLC specification should be based on the approved product specification and validated analytical procedure.
| Parameter | Specification |
|---|---|
| Appearance | white to off-white crystalline powder |
| Identification | IR & HPLC compliant |
| Assay (HPLC) | 98.0% – 102.0% |
| Loss on Drying | NMT 1.0% |
| Residue on Ignition | NMT 0.2% |
| Individual Impurity | NMT 0.5% |
| Total Impurities | NMT 1.0% |
| Water Content | NMT 0.5% |
| Melting Point | 140–145°C |