title: [Thieno[3,2-c]quinoline-4-yl-amines--synthesis and investigation of activity against malaria].
abstract: Thieno[3,2-c]quinoline-4-yl-amines - synthesis and investigation of activity against malaria pH-Dependant reduction of the methyl 2-(2-nitrophenyl)thiophene-3-carboxylate 3, formed by Suzuki coupling of methyl 2-iodothiophene-3-carboxylate (2) with 2-nitrophenylboronic acid, yielded the cyclic hydroxamic acid 4 and the lactam 5, respectively. The 4-chlorothieno[3,2-c]quinoline 6 was formed from the lactam 5 by heating with POCI3/PCI5s. Melting of 6 with the novaldiamine base in phenol gave the chloroquine analogue 7, whereas the amodiaquine and the pyronaridine analogues 8 and 9 were obtained using phenol Mannich bases. The reaction of 6 with putrescine and N,N'-bis(3-aminopropyl)piperazine as spacer formed the bisquinoline derivatives 10 and 11 as well as the monosubstituted quinoline 12. In the same manner the isomeric 4-chlorothieno[2,3-c]quinoline 13 reacted to yield the quinoline-4-yl-amines 14-16. The compounds 7-12 and 14-16 were tested for in vitro growth inhibition of the malaria parasite Plasmodium falciparum. As most active compound the pyronaridine derivative 9 displayed an IC50 value of 210 nM with the chloroquine sensitive P. falciparum strain 3D7 and 750 nM with the chloroquine resistant P. falciparum strain Dd2. The N,N'-bis(3-aminopropyl)piperazine derivative 11 displayed in vivo activity in Plasmodium vinckei infected mice with an ED50 value of 30 mg/kg after i.p. administration.
authors.affiliation: Institut für Pharmazeutische Chemie, Beethovenstrasse 55, D-38106 Braunschweig. k.goerlitzer@tu-bs.de
authors.forename: K
authors.initials: K
authors.lastname: Görlitzer
authors.forename: B
authors.initials: B
authors.lastname: Gabriel
authors.forename: H
authors.initials: H
authors.lastname: Jomaa
authors.forename: J
authors.initials: J
authors.lastname: Wiesner
mesh_terms: D000588:Amines / Q000138:chemical synthesis* / Q000494:pharmacology*; D000818:Animals; D000962:Antimalarials / Q000138:chemical synthesis* / Q000494:pharmacology*; D004912:Erythrocytes / Q000469:parasitology; D006801:Humans; D066298:In Vitro Techniques; D007202:Indicators and Reagents; D051379:Mice; D010963:Plasmodium falciparum / Q000187:drug effects; D011804:Quinolines / Q000138:chemical synthesis* / Q000494:pharmacology*
chemical_list: D000588:Amines; D000962:Antimalarials; D007202:Indicators and Reagents; D011804:Quinolines