title: Antihelminthic activity of some newly synthesized 5(6)-(un)substituted-1H-benzimidazol-2-ylthioacetylpiperazine derivatives.
abstract: Piperazine derivatives of 5(6)-substituted-(1H-benzimidazol-2-ylthio)acetic acids were synthesized by using two methods and studied for antihelminthic activity. The antiparasitic screening showed that compounds 18-24 exhibited higher activity against Trichinella spiralis in vitro in comparison to methyl 5-(propylthio)-1H-benzimidazol-2-yl-carbamate (albendazole). Most active were compounds 2-({2-[4-(4-chlorophenyl)piperazin-1-yl]-2-oxoethyl}thio)-1H-benzimidazole 21 and 2-{[2-oxo-2-(4-benzhydrylpiperazin-1-yl)ethyl]thio}-5(6)-methyl-1(H)-benzimidazole 19 as well as 2-({2-[4-(4-chlorophenyl)piperazin-1-yl]-2-oxoethyl}thio)-5(6)-methyl-1(H)-benzimidazole 23 with efficacy of 96.0%, 98.4% and 100%, respectively. The tested derivatives 15-19 and 20-23 were less active against Syphacia obvelata in vivo than albendazole and exhibited the same efficacy as piperazine, but in twice lower concentration.Compounds 2-({2-[4-(4-chlorophenyl)piperazin-1-yl]-2-oxoethyl}thio)-1H-benzimidazole 21, 1,4-bis[(5(6)-methyl-1(H)-benzimidazol-2-ylthio)acetyl]piperazine 17 and 2-({2-[4-(4-chlorophenyl)piperazin-1-yl]-2-oxoethyl}thio)-5(6)-methyl-1(H)-benzimidazole 23 had higher efficacies of 73%, 76%, and 77%, respectively.
authors.affiliation: Department of Organic Synthesis, University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria. anmav@abv.bg
authors.forename: Anelia Ts
authors.initials: ATs
authors.lastname: Mavrova
authors.forename: Kamelya K
authors.initials: KK
authors.lastname: Anichina
authors.forename: Dimitar I
authors.initials: DI
authors.lastname: Vuchev
authors.forename: Jordan A
authors.initials: JA
authors.lastname: Tsenov
authors.forename: Pavletta S
authors.initials: PS
authors.lastname: Denkova
authors.forename: Magdalena S
authors.initials: MS
authors.lastname: Kondeva
authors.forename: Mitka K
authors.initials: MK
authors.lastname: Micheva
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000009:adverse effects / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D001562:Benzimidazoles / Q000009:adverse effects / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D010124:Oxyuroidea / Q000187:drug effects*; D017160:Trichinella spiralis / Q000187:drug effects*
chemical_list: D000871:Anthelmintics; D001562:Benzimidazoles