Tadalafil Powder CAS 171596-29-5

Tadalafil raw material powder (CAS: 171596-29-5) is a highly selective phosphodiesterase type 5 (PDE5) inhibitor-a crystalline chemical intermediate. Appearing as an off-white crystalline powder with a stable molecular structure and well-defined physicochemical properties, it is widely used in pharmaceutical formulation development, pharmaceutical synthesis, and laboratory reference research. Leveraging mature synthesis processes, we achieve stable, large-scale production of high-purity material, catering to diverse B2B applications such as formulation development, preparation of reference standards, and the supply of raw materials for preliminary pharmacological testing.

As a classic PDE5 inhibitor intermediate, Tadalafil is a core raw material in the pharmaceutical formulation sector, valued for the long-acting characteristics of its molecular structure. We supply high-purity Tadalafil raw material, maintaining strict control over production and purification processes. Comprehensive quality control data is provided for every batch to meet the procurement and sampling needs of pharmaceutical R&D institutions, formulation manufacturers, and research organizations. We support supply across various scales, ensuring consistent quality and reliable delivery.

Basic Chemical Identification Parameters
Name	Tadalafil
CAS Number	171596-29-5
Full Chemical Name	(6R,12aR)-6-(1,3-benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methylpyrazino[1',2'
Molecular Formula	C22H19N3O4
Molecular Weight	389.40 g/mol (Exact monoisotopic mass
Molecular Structure Diagram
Physical Appearance and Properties
Form	Crystalline powder
Color	White to off-white/beige
Hygroscopicity	Essentially non-hygroscopic under standard storage conditions; exhibits slight moisture-absorbing characteristics
Key Physical Constants
Melting Point	298–300°C (range for some refined products
Specific Optical Rotation	[α]D²⁰ +68° to +78° (Solvent
Predicted Density	1.51 ± 0.1 g/cm³
Boiling Point (Calculated)	679.1 ± 55.0°C (760 mmHg)
Solubility (Key parameter for formulation development)
Water	Practically insoluble (<0.73 mg/L) Water)
Highly soluble	DMSO (Dimethyl sulfoxide, solubility ≥20 mg/mL), DMF (Dimethylformamide)
Sparingly/Slightly soluble	Methanol, Dichloromethane
Very slightly soluble	Ethanol, Ethyl acetate
Purity and standard QC parameters (typical for raw material supply)
Standard testing method	HPLC (High-Performance Liquid Chromatography)
Purity of refined raw material	≥98%, ≥99% (HPLC)
Associated quality testing	Pharmacopoeia-standard parameters such as individual impurities, total impurities, water content, residual solvents, heavy metals, residue on ignition, etc.

D-Tryptophan methyl ester and 3,4-methylenedioxybenzaldehyde were dissolved in dichloromethane; trifluoroacetic acid was added dropwise at 0°C, and the mixture was allowed to react at room temperature for 4 days. Dichloromethane was added, and the mixture was washed with saturated sodium bicarbonate solution and water, dried, and filtered. The filtrate was concentrated under reduced pressure, and the residue was purified by column chromatography (eluting with a 97:3 mixture of dichloromethane and ethyl acetate) to yield methyl (1R,3R)-1,2,3,4-tetrahydro-1-(3,4-methylenedioxyphenyl)-9H-pyrido[3,4-b]indole-3-carboxylate. This compound and sodium bicarbonate were dissolved in chloroform; chloroacetyl chloride was added dropwise at 0°C, and the mixture was stirred for 1 hour. Chloroform was added, followed by the dropwise addition of water and saturated sodium bicarbonate solution under stirring. The organic layer was separated, washed with water until neutral, and dried. After filtration and concentration of the filtrate under reduced pressure, the residue was recrystallized from diethyl ether. The resulting solid was suspended in methanol, and a 33% solution of methylamine in ethanol was added at room temperature; the mixture was then reacted at 50°C under a nitrogen atmosphere for 16 hours. The solvent was removed under reduced pressure, and the residue was dissolved in dichloromethane, washed with water, dried, and filtered. The filtrate was concentrated to dryness, and the residue was purified by column chromatography followed by recrystallization from isopropanol to obtain the product.