title: A concise synthesis of the naphthalene portion of purpuromycin.
abstract: A concise synthesis of naphthalene compounds for incorporation into a synthetic sequence for the rubromycin family of natural products is presented. These highly substituted naphthalenes are generated in seven and nine steps, respectively, from 2,4,5-trimethoxybenzaldehyde. Three ring-forming methods were explored and the controlled oxygenation of different positions was investigated to yield differentially substituted/protected systems. Key steps to the final products include a Stobbe condensation to form the ring system and a novel series of regioselective oxidations to introduce the required oxygen functionality. These naphthalene products incorporate orthogonal protecting groups and are suitable for combination with a variety of coupling partners.
authors.affiliation: Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
authors.forename: Andrew N
authors.initials: AN
authors.lastname: Lowell
authors.forename: Michael W
authors.initials: MW
authors.lastname: Fennie
authors.forename: Marisa C
authors.initials: MC
authors.lastname: Kozlowski
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D009281:Naphthalenes / Q000737:chemistry*; D009285:Naphthoquinones / Q000138:chemical synthesis / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared
chemical_list: D009281:Naphthalenes; D009285:Naphthoquinones; C031721:naphthalene; C009115:purpuromycin