(Z)-Ethyl 2-phenyl-1-(2-vinylphenyl)vinylcarbamates. Part 1: Synthesis and preliminary studies on their divergent transformation into benzo[c]phenanthridines and 2-phenyl-1,4-naphthoquinones
                                
                                    
                                        作者:Mónica Treus、Cristian O. Salas、Marcos A. Gonazález、Juan C. Estévez、Ricardo A. Tapia、Ramón J. Estévez                                    
                                    
                                        DOI:10.1016/j.tet.2010.10.035
                                    
                                    
                                        日期:2010.12
                                    
                                    Treatment of N-carbethoxy-1-benzylideneisoquinolines with LDA gives N-ethoxycarbonyl-1-amino-1-(2-vinylphenyl)-2-phenylethylenes, which can easily be transformed into N-carbethoxy-1-amino-2-phenylnaphthalenes. Bischler-Napieralski reaction of these latter compounds affords the corresponding benzo[c]phenanthridines, while their hydrolysis and subsequent oxidation constitutes a novel route to 2-phenyl-1,4-naphthoquinones. (c) 2010 Elsevier Ltd. All rights reserved.