Total synthesis of eurypamides, marine cyclic-isodityrosines from the Palauan sponge Microciona eurypa
                                
                                    
                                        作者:Miyuki Ito、Maki Yamanaka、Noriki Kutsumura、Shigeru Nishiyama                                    
                                    
                                        DOI:10.1016/j.tet.2004.04.062
                                    
                                    
                                        日期:2004.6
                                    
                                    Total synthesis of eurypamides A, B, and D, 1, 2, and 4, has been successfully accomplished. The Tl(NO3)(3) (TTN) oxidation of the halogenated bisphenols, 14a, 14b, 24, and 43, effected regio-controlled cyclization to provide the corresponding diaryl ethers, 15a, 15b, 25, and 46. This investigation revealed a structural revision of eurypamide A as to possess (2"S,3"R,4"S)-configuration (47), along with the spectral data of pure 2 and 4, which were previously characterized in a mixture. (C) 2004 Elsevier Ltd. All rights reserved.