Chemical properties and industrial applications of Tada raw materials:

1. Chemical structure and synthesis process

• Molecular structural features: Tadalafil, also known as (6R, 12aR) -6- (1,3-benzodioxolan-5-yl) -2-methyl-2,3,6,7,12,12a-hexahydropyrazino [1 ', 2': 1,6] pyrido [3,4-b] indole-1,4-dione, has a molecular formula of C22H19N3O4 and belongs to the selective PDE5 inhibitor class.

• Synthesis pathway: In industry, it is mainly synthesized through multi-step reactions, with key steps including the construction of indole rings, stereoselective control of chiral centers, and purification of the final product (commonly by crystallization or chromatography).

2. Physical and chemical properties

• Solubility: Slightly soluble in water (<1mg/mL, 25 ℃), easily soluble in organic solvents such as dimethyl sulfoxide (DMSO) and methanol.

Stability: The raw materials should be stored in a cool and dry environment (recommended temperature of 2-8 ℃) away from light and sealed. Prolonged exposure to humid and hot conditions can easily degrade.

3. Industrial quality standards

Purity requirement: The purity of the raw material is usually ≥ 99.0% (detected by HPLC method), and the total amount of impurities should be<0.5%.

Key indicators: including residual solvents (such as methanol, ethyl acetate), heavy metal content (≤ 10ppm), and microbial limits.

4. Application and Market

• Formulation raw materials: mainly used for the production of film coated tablets, oral soluble films and other dosage forms, which must comply with GMP production standards.

Supply chain: China and India are the main production areas.