title: Synthesis of a simplified triazole analogue of pateamine A.
abstract: Pateamine A is a naturally occurring metabolite extracted from the marine sponge Mycale hentscheli. It exhibits potent cytotoxicity towards cancer cell lines and has been shown to target protein translation initiation via inhibition of the function of eukaryotic initiation factor 4A proteins. We have synthesised a simplified analogue of pateamine A, consisting of the skeletal core of the natural product but with the thiazole heterocycle replaced by a triazole. The convergent design of the synthesis features a base-induced opening of a δ-valerolactone to access the Z,E-dienoate moiety, Julia-Kocienski olefination and copper-catalysed azide-alkyne cycloaddition. Bioactivity testing of the simplified pateamine A analogue (3) indicated a significant reduction in cytotoxicity, compared to natural pateamine A. We propose that this reduced activity is due mainly to the substitution of the thiazole for the triazole heterocycle. This supports the hypothesis that the thiazole of pateamine A is important for binding to its biological target.
authors.affiliation: School of Chemical and Physical Sciences and Centre for Biodiscovery, Victoria University of Wellington, Wellington, New Zealand.
authors.forename: A
authors.initials: A
authors.lastname: Hemi Cumming
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Brown
authors.forename: Xu
authors.initials: X
authors.lastname: Tao
authors.forename: Claire
authors.initials: C
authors.lastname: Cuyamendous
authors.forename: Jessica J
authors.initials: JJ
authors.lastname: Field
authors.forename: John H
authors.initials: JH
authors.lastname: Miller
authors.forename: Joanne E
authors.initials: JE
authors.lastname: Harvey
authors.forename: Paul H
authors.initials: PH
authors.lastname: Teesdale-Spittle
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry*; D001386:Azides / Q000737:chemistry; D002384:Catalysis; D060326:Chemistry Techniques, Synthetic; D003300:Copper / Q000737:chemistry; D004852:Epoxy Compounds / Q000737:chemistry*; D018942:Macrolides / Q000737:chemistry*; D013844:Thiazoles / Q000737:chemistry*; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D001386:Azides; D004852:Epoxy Compounds; D018942:Macrolides; D013844:Thiazoles; D014230:Triazoles; C421324:pateamine A; D003300:Copper