Oxibendazole

Last updated
Oxibendazole
Oxibendazole.svg
Clinical data
AHFS/Drugs.com International Drug Names
ATCvet code
Legal status
Legal status
  • Veterinary use only
Identifiers
  • Methyl N-(6-propoxy-1H-benzimidazol-2-yl)carbamate
CAS Number
PubChem CID
ChemSpider
UNII
KEGG
CompTox Dashboard (EPA)
ECHA InfoCard 100.039.873 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C12H15N3O3
Molar mass 249.270 g·mol−1
3D model (JSmol)
  • CCCOC1=CC2=C(C=C1)N=C(N2)NC(=O)OC
  • InChI=1S/C12H15N3O3/c1-3-6-18-8-4-5-9-10(7-8)14-11(13-9)15-12(16)17-2/h4-5,7H,3,6H2,1-2H3,(H2,13,14,15,16) X mark.svgN
  • Key:RAOCRURYZCVHMG-UHFFFAOYSA-N X mark.svgN
 X mark.svgNYes check.svgY  (what is this?)    (verify)

Oxibendazole is a benzimidazole drug that is used to protect against roundworms, strongyles, threadworms, pinworms and lungworm infestations in horses and some domestic pets. [1] [2] It is usually white to yellowish in appearance, and may take the form of a powder, tablet or paste.

Synthesis

Oxibendazole synthesis: Oxibendazole synthesis.svg
Oxibendazole synthesis:

4‑Hydroxyacetamide (1) is alkylated with n-propyl bromide in the presence of potassium hydroxide to give the ether (2). Nitration of this product with nitric and sulfuric acids proceeds at the position ortho to the amide group (3), which is then reduced with SnCl2 to yield the phenylenediamine derivative (4). Reaction of that intermediate with S-methyl isothiourea proceeds first by aromatic cyclisation to the guanidine derivative followed by elimination of methyl mercaptan to yield the 2-aminobenzimidazole system (5). Acylation with methyl chloroformate results in the formation of a urethane on the amino group to produce oxibendazole (6).

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References

  1. Theodorides VJ, Chang J, DiCuollo CJ, Grass GM, Parish RC, Scott GC (December 1973). "Oxibendazole, a new broad spectrum anthelmintic effective against gastrointestinal nematodes of domestic animals". The British Veterinary Journal. 129 (6): xcontdvii–scvi. doi:10.1016/s0007-1935(17)36351-0. PMID   4779247.
  2. Bowman DD (2009). "Chapter 6: Anti-parasitic Drugs". Georgis' parasitology for veterinarians (9th ed.). St. Louis, Mo.: Saunders/Elsevier. p. 280. ISBN   978-1-4160-4412-3.
  3. GB 1123317,"Anthelmintic compositions containing benzimidazole derivatives",published 1968-08-14, assigned to Smith Kline French Labs; US 3574845,Actor PP, Pagano JF,"Anthelmintic compositions and methods employing esters of benzimidazolyl carbamic acids and their thio analogs",issued 13 April 1971, assigned to Smith Kline and French Laboratories Ltd