zomepirac Chemical Properties

Melting point:

178-179°

Boiling point:

470.8±45.0 °C(Predicted)

Density 

1.28±0.1 g/cm3(Predicted)

solubility 

Methanol (Sparingly), Water (Slightly)

pka

pKa 4.57(H2O-EtOH (1:1 v/v)) (Uncertain)

form 

Solid

color 

Off-White to Yellow

Stability:

Hygroscopic

zomepirac Usage And Synthesis

Originator

Zomex,Cilag,Switz,1979

Uses

Zomepirac is an analgesic, anti-inflammatory drug.

Definition

ChEBI: Zomepirac is a member of pyrroles, a member of monochlorobenzenes, a monocarboxylic acid and an aromatic ketone. It has a role as a non-steroidal anti-inflammatory drug and a cardiovascular drug. It is functionally related to an acetic acid.

Manufacturing Process

5-(p-Chlorobenzoyl)-3-carboxy-1,4-dimethylpyrrole-2-acetic acid: A suspension of 17.3 g (0.0435 mol) of ethyl 5-(p-chlorobenzoyl)-1,4-dimethyl- 3-ethoxypyrrole-2-acetate in 170 g of 25% hydroxide is heated under reflux for 3 hours. The suspension is poured into ice and the resulting yellow solution is added to ice-hydrochloric acid with stirring. The precipitated solid is collected by filtration, air dried and recrystallized from acetone containing 10% water to give 5-(p-chlorobenzoyl)-3-carboxy-1,4-dimethylpyrrole-2-acetic acid as a white solid; melting point 253°C to 254°C.
Ethyl 5-(p-chlorobenzoyl)-3-carboxy-1,4-dimethylpyrrole-2-acetate: A suspension of 2.0 g of 5-(p-chlorobenzoyl)-3-carboxy-1,4-dimethylpyrrole-2- acetic acid in 20 ml of 0.5% ethanolic hydrogen chloride is heated under reflux. The solid gradually dissolves. After 40 minutes a white crystalline solid precipitates. The solution is cooled and the solid product, ethyl 5-(p- chlorobenzoyl)-3-carboxy-1,4-dimethylpyrrole-2-acetate, is filtered and dried, melting point 197°C to 198°C.
Ethyl 5-(p-chlorobenzoyl)-1,4-dimethylpyrrole-2-acetate: A 9.0 g (0.0255 mol) sample of ethyl 5-(p-chlorobenzoyl)-3-carboxy-1,4-dimethylpyrrole-2- acetate is heated under nitrogen at 210°C to 230°C for 2 hours. Gas is evolved. The residue is molecularly distilled in a sublimator at 195°C, 0.05 mm/Hg. The sublimate is recrystallized from cyclohexane to give ethyl 5-(p- chlorobenzoyl)-1,4-dimethylpyrrole-2-acetate as a white solid, melting point 107°C to 109°C.
5-(p-Chlorobenzoyl)-1,-4dimethylpyrrole-2-ecetic acid: A suspension of 4.0 g (0.0125 mol) of ethyl 5-(p-chlorobenzoyl)-1,4-dimethylpyrrole-2-acetate in 26 ml of 0.5 N sodium hydroxide (0.013 mol) is heated under reflux for 30 minutes. The resulting solution is acidified with dilute hydrochloric acid, and the precipitated solid is collected by filtration, air dried and recrystallized from 2-propanol to give 5-(p-chlorobenzoyl)-1,4-dimethylpyrrole-2-acetic acid as a white crystalline solid, melting point 178°C to 179°C.

brand name

Calinador;Calmador;Dolgenal;Dolwas;Mcn 2783-21-98;Miranil;Zomaxin;Zopirac.

Therapeutic Function

Analgesic, Antiinflammatory

World Health Organization (WHO)

Zomepirac, a nonsteroidal anti-inflammatory agent, was introduced in 1979 for the treatment of rheumatic disorders and the management of moderate to severe pain. By 1983 its use had been associated with serious allergic reactions, including five deaths from anaphylaxis. This led to voluntary withdrawal of the drug from markets worldwide by the major manufacturer.

zomepirac(33369-31-2)Related Product Information

• 3-carboxy-5-(4-chlorobenzoyl)-1,4-dimethyl-1H-pyrrole-2-acetic acid
• ethyl 5-(4-chlorobenzoyl)-alpha,1,4-trimethyl-1H-pyrrole-2-acetate
• ZOMEPIRAC SODIUM SALT
• ethyl 3-carboxy-5-(4-chlorobenzoyl)-1,4-dimethyl-1H-pyrrole-2-acetate
• zomepirac
• ethyl 5-(4-chlorobenzoyl)-1,4-dimethyl-1H-pyrrole-2-acetate
• ethyl 5-(4-chlorobenzoyl)-3-(ethoxycarbonyl)-1,4-dimethyl-1H-pyrrole-2-acetate