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HomeProduct name listPirenzepine hydrochloride

Pirenzepine hydrochloride

Synonym(s):5,11-Dihydro-11-[(4-methyl-1-piperazinyl)acetyl]-6H-pyrido[2,3-b][1,4]benzodiazepin-6-one dihydrochloride

  • CAS NO.:29868-97-1
  • Empirical Formula: C19H22ClN5O2
  • Molecular Weight: 387.87
  • MDL number: MFCD00055214
  • EINECS: 249-907-5
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-11-08 20:21:46
Pirenzepine hydrochloride Structural

What is Pirenzepine hydrochloride?

Description

Pirenzepine is an antagonist of M1 muscarinic acetylcholine receptors (Ki = 11.48 nM). It is selective for M1 over M2, M3, and M4 receptors (Kis = 602.56, 151.36, and 199.53 nM, respectively). Pirenzepine inhibits ascending reflex contraction of the circular smooth muscle in isolated guinea pig ileal segments induced by intraluminal balloon inflation (IC50 = 501.19 nM). It inhibits methacholine-induced increases in ileal pressure in guinea pigs (ID50 = 724.44 nmol/kg). Pirenzepine inhibits oxotremorine-induced gastric ulcer, gastric acid secretion, and salivation in rats (ED50s = 13, 37.5, and 620 μg/kg i.v., respectively). It prevents form-deprivation myopia (FDM) in a chick model of experimental myopia.

Chemical properties

Solid

Originator

Microsules Bernabo, Microsules Bernabo

The Uses of Pirenzepine hydrochloride

An antiulcerative. Tricyclic gastric-acid inhibitor

The Uses of Pirenzepine hydrochloride

Antiulcerative;M1 antagonist

The Uses of Pirenzepine hydrochloride

An antiulcerative. Tricyclic gastric-acid inhibitor.

What are the applications of Application

Pirenzepine Dihydrochloride is an mAChR M1 selective antagonist

Manufacturing Process

48.4 g of 5,11-dihydro-6H-pyrido[2,3-b][1,4]benzo-diazepin-6-one were refluxed in 900 ml of absolute dioxane for 15 minutes. Thereafter, over a period of 45 minutes, 28 ml of chloroacetyl chloride and 52 ml of triethylamine were simultaneously added dropwise to the mixture. The mixture was refluxed for eight hours and then vacuum-filtered after having cooled. The filtrate was evaporated in vacuum. The crystalline residue was recrystallized from acetonitrile in the presence of activated charcoal. MP: 212°-213°C (with decomposition). Yield: 85% of theory.
A mixture of 67.5 g of 11-chloroacetyl-5,11-dihydro-6H-pyrido[2,3b][1,4]benzodiazepin-6-one, 183 ml of N-methylpiperazine and 1.37 liters of absolute benzene was refluxed for 18 hours. Thereafter, the crystalline precipitate was vacuum filtered off, dissolved in aqueous 20% hydrochloric acid, the solution was evaporated in vacuum, the crystalline residue wasdissolved in 250 ml of water while heating, the solution was admixed with 150 ml of isopropanol and active charcoal, filtered, and 2.5 liters of isopropanol were added to the filtrate. After cooling, the precipitate was vacuum filtered off, yielding 70% of theory of the 5,11-dihydro-11-[(4'-methyl-1'-piperazinyl)acetyl]-6H-pyrido[2,3-b][1,4]benzodiazepin-6-one dihydrochloride, M.P. 257259°C (decomp.).
The free base of pirenzepine, obtained from the dihydrochloride by making an aqueous solution thereof alkaline with dilute sodium hydroxide and extracting it with chloroform, had MP: 226°-228°C after recrystallization from methanol/ether.

Therapeutic Function

Antiulcer, Antiemetic

General Description

Pirenzepine dihydrochloride is an anticholinergic agent. It is also considered as an antiulcer drug. It is used to treat myopia, gastric and duodenal ulcers. Pirenzepine dihydrochloride induces the dimerization of muscarinic M1 receptors.

Biochem/physiol Actions

Selective M1 muscarinic acetylcholine receptor antagonist.

storage

Store at RT

Properties of Pirenzepine hydrochloride

Melting point: 248-250°C
storage temp.  Inert atmosphere,2-8°C
solubility  H2O: 50 mg/mL
form  powder
color  white
Water Solubility  Soluble to 100 mM in water
Sensitive  Hygroscopic
CAS DataBase Reference 29868-97-1(CAS DataBase Reference)

Safety information for Pirenzepine hydrochloride

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H302:Acute toxicity,oral
H315:Skin corrosion/irritation
H317:Sensitisation, Skin
H319:Serious eye damage/eye irritation
H402:Hazardous to the aquatic environment, acute hazard
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P270:Do not eat, drink or smoke when using this product.
P272:Contaminated work clothing should not be allowed out of the workplace.
P273:Avoid release to the environment.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P302+P352:IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P333+P313:IF SKIN irritation or rash occurs: Get medical advice/attention.
P337+P313:IF eye irritation persists: Get medical advice/attention.

Computed Descriptors for Pirenzepine hydrochloride

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