A Short Total Synthesis of Benzophenanthridine Alkaloids via a Rhodium(III)-Catalyzed C–H Ring-Opening Reaction
作者:Narasingan Aravindan、Masilamani Jeganmohan
DOI:10.1021/acs.joc.1c01612
日期:2021.11.5
The biologically important naturally available benzophenanthridines were prepared efficiently in three steps with overall good yields. A new synthetic methodology involving a rhodium(III) catalyzed redox-neutral ring-opening of 7-azabenzonorbornadienes with aromatic aldoximes is developed to synthesize the target molecules. The developed C–H ring-opening reaction is highly diastereoselective and compatible
One-Pot Synthesis of Benzo[<i>c</i>]phenanthridine Alkaloids from 7-Azabenzonorbornadienes and Aryl Nitrones
作者:Narasingan Aravindan、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.3c01192
日期:2023.6.2
An efficient synthesis of benzo[c]phenanthridine alkaloids via a synergistic combination of C–C bond formation and a cycloaromatization reaction is described. Aryl nitrones react with 7-azabenzonorbornadienes in the presence of a Rh(III) catalyst, providing pharmaceutically useful benzo[c]phenanthridine derivatives in good to moderate yields. Using this methodology, highly useful alkaloids such as
描述了通过 C-C 键形成和环芳构化反应的协同组合有效合成苯并 [ c ] 菲啶生物碱。在 Rh(III) 催化剂存在下,芳基硝酮与 7-氮杂苯并降冰片二烯反应,以良好至中等收率提供药学上有用的苯并 [ c ] 菲啶衍生物。使用这种方法,可以在一个步骤中制备非常有用的生物碱,例如诺法加龙宁、去甲白屈菜红碱、地卡林、去甲血根碱和去甲尼替丁。
(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.
Olugbade, Tiwalade A.; Waigh, Roger D.; Mackay, Simon P., Journal of the Chemical Society. Perkin transactions I, 1990, # 10, p. 2657 - 2660
作者:Olugbade, Tiwalade A.、Waigh, Roger D.、Mackay, Simon P.
DOI:——
日期:——
Studies in SRN1 series. Part 14. Direct synthesis of benzo[c]phenanthridines and benzo[c]phenanthridones via SRN1 reactions