An efficient synthesis of bruceolline E was completed in three steps from the known ethyl indole-l-carboxylate (9d) in 60% overall yield, via a tandem acylation/Nazarov cyclization with 3,3-dimethyl acrylic acid followed by selenium dioxide oxidation to install the alpha-diketone functionality. (C) 2011 Elsevier Ltd. All rights reserved.
Unprecedented total synthesis of bruceolline D, E, and H
作者:Dnyaneshwar Gaikwad
DOI:10.1080/00397911.2020.1795199
日期:2020.10.17
employed to obtain 3-prenylated indoles. The resulting indoles on the consecutive sequence of epoxidation, cyclization and further oxidation afforded short, protecting group free total synthesis of bruceolline D, E and H. Graphical Abstract
摘要 Wittig 烯化-克莱森重排的单锅策略已被用于获得3-异戊二烯化吲哚。在环氧化、环化和进一步氧化的连续序列上产生的吲哚提供了短的、无保护基团的布鲁氏碱 D、E 和 H 的全合成。
Phosphine-catalysed denitrative rearomatising (3 + 2) annulation of α,β-ynones and 3-nitroindoles
作者:Lona Dutta、Anwita Chattopadhyay、Nisha Yadav、S. S. V. Ramasastry
DOI:10.1039/d2ob02180c
日期:——
We describe a metal-free strategy to access various α-arylidene cyclopenta[b]indoles via phosphine-catalysed (3 + 2) annulation of α,β-ynones and 3-nitroindoles. For the first time, the rearomatisation of the indole nucleus was observed in such an annulative transformation. The method was extended to the synthesis of an antimalarial natural product, bruceolline E.
Iron-Mediated Hydrogen Atom Transfer Radical Cyclization of Alkenyl Indoles and Pyrroles Gives Their Fused Derivatives: Total Synthesis of Bruceolline E and H
作者:Santosh J. Gharpure、Rupali S. Chavan、Simran R. Narang
DOI:10.1021/acs.orglett.4c00032
日期:——
employed for the synthesis of dihydropyrroloindoles and dihydropyrrolizines via 5-exo-trig radical cyclization where indoles and pyrroles are used as an acceptor. This radical approach has also been extended for the synthesis of tetrahydrocyclopenta[b]indolones via the Baldwin-disfavored 5-endo-trig cyclization pathway. The formal synthesis of bruceolline J and the totalsynthesis of bruceollines E
铁介导的氢原子转移(HAT)反应可有效地用于通过 5- exo - trig自由基环化合成二氢吡咯并吲哚和二氢吡咯嗪,其中吲哚和吡咯用作受体。这种激进的方法还被扩展到通过鲍德温不喜欢的 5- end - trig环化途径合成四氢环戊[ b ]吲哚酮。采用前一种策略,布鲁斯酚J的正式合成以及布鲁斯酚E和H的全合成都已顺利进行。
A concise total synthesis of bruceolline E
作者:Jason A. Jordan、Gordon W. Gribble、Jeanese C. Badenock
DOI:10.1016/j.tetlet.2011.10.023
日期:2011.12
An efficient synthesis of bruceolline E was completed in three steps from the known ethyl indole-l-carboxylate (9d) in 60% overall yield, via a tandem acylation/Nazarov cyclization with 3,3-dimethyl acrylic acid followed by selenium dioxide oxidation to install the alpha-diketone functionality. (C) 2011 Elsevier Ltd. All rights reserved.
A Short, Protecting Group-Free Total Synthesis of Bruceollines D, E, and J
作者:Justin M. Lopchuk、Ilene L. Green、Jeanese C. Badenock、Gordon W. Gribble
DOI:10.1021/ol402042f
日期:2013.9.6
short, protecting group-free totalsynthesis of bruceollines D, E, and J has been achieved. The enantioselective reduction of bruceolline E with β-chlorodiisopinocampheylborane delivers both the natural and unnaturalenantiomers of bruceolline J in excellent yields and enantioselectivities. Reduction with baker’s yeast and sucrose was shown to provide the unnaturalenantiomer of bruceolline J in 98% ee