title: Lepadins D-F: antiplasmodial and antitrypanosomal decahydroquinoline derivatives from the tropical marine tunicate Didemnum sp.
abstract: From a new tunicate species, belonging to the genus Didemnum, three alkaloids possessing an unusual and extremely rare decahydroquinoline skeleton and showing significant and selective antiplasmodial and antitrypanosomal activity were obtained as follows: (2R*,3S*,4aR*,5R*,8aS*)-decahydro-3-hydroxy-5-(5'-hydroxyoctyl)-2-methylquinoline (lepadin D,1), its quaternary nitrogen derivative (2), (2R*,2"E,3S*,4aR*,5R*,8aS*)-decahydro-3-hydroxy-5-(5'-hydroxyoctyl)-2-methyl-3-quinolinyl ester 2"-octenoic acid (lepadin E, 3), and (2S*,2"E,3S*,4aR*,5R*,8aS*)-decahydro-3-hydroxy-5-(5'-hydroxyoctyl)-2-methyl-3-quinolinyl ester 2"-octenoic acid (lepadin F, 4). These isolates may well serve as lead structures for the development of new antimalarial drugs.
authors.affiliation: Institute for Pharmaceutical Biology, Technical University of Braunschweig, Mendelssohnstrasse 1, 38106 Braunschweig, Germany. a.wright@uni-bonn.de
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Wright
authors.forename: Eva
authors.initials: E
authors.lastname: Goclik
authors.forename: Gabriele M
authors.initials: GM
authors.lastname: König
authors.forename: Ronald
authors.initials: R
authors.lastname: Kaminsky
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D000818:Animals; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000977:Antiparasitic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D001315:Australia; D004912:Erythrocytes / Q000187:drug effects / Q000469:parasitology; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010963:Plasmodium falciparum / Q000187:drug effects; D011804:Quinolines / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D014344:Trypanocidal Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D016833:Trypanosoma brucei rhodesiense / Q000187:drug effects; D014349:Trypanosoma cruzi / Q000187:drug effects; D014561:Urochordata / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D000962:Antimalarials; D000977:Antiparasitic Agents; D011804:Quinolines; D014344:Trypanocidal Agents; C461205:decahydro-3-hydroxy-5-(5'-hydroxyoctyl)-2-methyl-3-quinolinyl ester 2''-octenoic acid; C461204:decahydro-3-hydroxy-5-(5'-hydroxyoctyl)-2-methylquinoline; C455162:lepadin F