title: Synthetic strategies to a telomere-targeted pentacyclic heteroaromatic salt.
abstract: Three routes have been explored to synthesise the telomere-targeted agent 3,11-difluoro-6,8,13-trimethyl-8H-quino[4,3,2-kl]acridinium methosulfate . Application of a 6-(2-azidophenyl)phenanthridine precursor gave an entry to the indazolo[2,3-f]phenanthridine ring system not the required quino[4,3,2-kl]acridine. A six step synthesis starting from 2,6-dibromo-4-methylbenzonitrile via a 1-arylacridin-9(10H)-one intermediate, or , gave the required in low overall yield (<10%). The most efficient route entailed the one-pot (five step) conversion of 1,2-dimethyl-6-fluoroquinolinium methosulfate to in 33% yield employing triethylamine as base and nitrobenzene as solvent.
authors.affiliation: Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, UK.
authors.forename: Ian
authors.initials: I
authors.lastname: Hutchinson
authors.forename: Malcolm F G
authors.initials: MF
authors.lastname: Stevens
mesh_terms: D000166:Acridines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D015394:Molecular Structure; D019098:Telomerase / Q000037:antagonists & inhibitors; D016615:Telomere / Q000187:drug effects*
chemical_list: C438609:3,11-difluoro-6,8,13-trimethyl-8H-quino(4,3,2-kl)acridinium; D000166:Acridines; D019098:Telomerase