title: Total synthesis of (-)-martinellic acid via radical addition-cyclization-elimination reaction.
abstract: The asymmetric total synthesis of martinellic acid, the first pyrrolo[3,2-c]quinoline alkaloid found in nature, is described. Three key steps in our synthesis of (-)-martinellic acid are the Bu(3)SnH-promoted radical addition-cyclization-elimination (RACE) reaction of an oxime ether with an alpha,beta-unsaturated ester to generate the pyrrolo[3,2-c]quinoline core, a chemoselective lactam carbonyl reduction, and guanidinylation under Mitsunobu reaction conditions. The key radical cyclization has also been investigated by using SmI(2). (-)-Martinellic acid was synthesized from commercially available methyl 4-bromo-3-methylbenzoate in fewer steps than previous syntheses and in an improved overall yield.
authors.affiliation: Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Shirai
authors.forename: Okiko
authors.initials: O
authors.lastname: Miyata
authors.forename: Norimitsu
authors.initials: N
authors.lastname: Tohnai
authors.forename: Mikiji
authors.initials: M
authors.lastname: Miyata
authors.forename: David J
authors.initials: DJ
authors.lastname: Procter
authors.forename: David
authors.initials: D
authors.lastname: Sucunza
authors.forename: Takeaki
authors.initials: T
authors.lastname: Naito
mesh_terms: D003500:Cyclization; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D011758:Pyrroles / Q000138:chemical synthesis* / Q000737:chemistry; D011804:Quinolines / Q000138:chemical synthesis* / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D011758:Pyrroles; D011804:Quinolines; C432345:martinellic acid