A new route to 3-(2-vinylphenyl)-2-methyl-2H-isoquinolin-1-ones and benzo[c]phenanthridines: total synthesis of fagaronine
作者:Mónica Treus、Juan C Estévez、Luis Castedo、Ramón J Estévez
DOI:10.1016/s0040-4039(02)01013-4
日期:2002.7
N-ethoxycarbonyl-1-amino-1-(2-vinylphenyl)-2-phenylethylenes, which can be transformed into 3-(2-vinylphenyl)-2-methyl-2H-isoquinolin-1-ones by Bischler–Napieralski reactions, and thence into benzo[c]phenanthridin-6-ones. The use of this route for a new total synthesis of fagaronine is described.
用LDA处理N-碳乙氧基-1-亚苄基异喹啉可得到N-乙氧基羰基-1-氨基-1-(2-乙烯基苯基)-2-苯基乙烯,可以将其转化为3-(2-乙烯基苯基)-2-甲基-2。H-异喹啉-1-酮通过Bischler-Napieralski反应,并由此生成苯并[ c ]菲啶-6-酮。描述了将该途径用于新的全合成法格罗宁的用途。
Synthesis of Benzo[<i>c</i>]phenanthridine Alkaloids by Pd(OAc)<sub>2</sub>-Induced Direct Aromatic Carbonylation
The Pd(OAc)2-inducedcarbonylation of alkoxy-substituted 1-amino-2-phenyltetralins and 1-amino-2-phenylnaphthalenes was examined to provide the benzo[c]phenanthridine ring system. The carbonylation of substrates containing methylenedioxy groups gave oxysanguinarine and oxyavicine. The tetramethoxy derivatives gave O-methyloxyfagaronine. The substrate with a benzyloxy group afforded a known synthetic
synthesize cis-fused dihydrobenzo[c]phenanthridinones. The amide group functions as a directing group as well as a leaving group and provides an easy access to the pharmaceutically useful benzo[c]phenanthridinealkaloids such as nitidine and fagaronine analogues. The present methodology is compatible with various functional groups with respect to azabicyclic alkenes and aromatic amides. The reaction mechanism
已开发出一种高效的钌 (II) 催化串联 C-C/C-N 键与芳基酰胺和 7-氮杂苯并降冰片二烯形成合成顺式稠合二氢苯并[ c ]菲啶酮。酰胺基团起导向基团和离去基团的作用,并提供了一种容易获得药学上有用的苯并[ c ]菲啶生物碱如尼替丁和法加罗宁类似物的途径。本方法与关于氮杂双环烯烃和芳族酰胺的各种官能团相容。氘标记研究提出并支持了涉及定向基团辅助 C-H 活化的反应机制。
(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 common and general access to berberine and benzo [c] phenanthridine alkaloids
作者:René Beugelmans、Michèle Bois-Choussy
DOI:10.1016/s0040-4020(01)80496-8
日期:1992.1
The S(RN)1 reactions between o-iodobenzamides and the enolate anion from 2-acetyl homoveratric acid lead to key tricyclic compounds which are easily converted to either berberine or benzo [c] phenanthridine ring systems providing thus a high-yielding and versatile access to both classes of alkaloids.