(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.
A formal new access to the benzo[c]phenanthridine alkaloids, synthesis of nitidine and o-methyl fagaronine analogues.
作者:Yves L. Janin、Emile Bisagni
DOI:10.1016/s0040-4020(01)80559-7
日期:1993.1
reaction but omitting the acetic anhydride usually present in the reaction mixture. From these amines, through the thermal cyclization of their corresponding ethyl carbamates, a new access to the benzo[c]phenanthridin-6(5H)-ones was found. Preparation of water-soluble Nitidine and O-Methyl Fagaronine analogues bearing an alkylamino side chain on the C-6 position was achieved from these compounds.