Synthesis and antibiotic activity of the tricyclic furo[3,2-c] isochromen-2-trione unit of the pyranonaphthoquinones
                                
                                    
                                        作者:Darı́o A. Bianchi、Emma G. Sutich、Teodoro S. Kaufman                                    
                                    
                                        DOI:10.1016/j.bmcl.2003.11.015
                                    
                                    
                                        日期:2004.2
                                    
                                    The elaboration and biological activity of 15, containing the proposed pharmacophore for the antibiotic activity of the pyranonaphthoquinones, are reported. The synthetic strategy involved acid-catalyzed lactonization of mandelate 17 for isochroman ring formation, in combination with a Wittig-oxa-Michael functionalization of isochroman-3-ol derivative 20, a lactonization involving configurational inversion of a benzylic alcohol and a final AgO oxidation. Compound 15 showed activity against Staphylococcus aureus and Bacillus subtilis with MIC of 64 and 32 mug/mL, respectively. (C) 2003 Elsevier Ltd. All rights reserved.