Results 161 to 170 of about 2,045 (191)

Alternative partial synthesis of bisindole alkaloids

Tetrahedron Letters, 1990
Abstract Indoline derivatives of the pericyclivine series are oxidized at position 6 with DDQ; the corresponding alcohols are coupled with nucleophilic indolines under acid conditions to yield dimers similar to undulatine.
G. Massiot, J.M. Nuzillard, B. Richard, L. Le Men-Olivier   +3 more
openaire   +1 more source

Biologically active indole and bisindole alkaloids from Tabernaemontana divaricata

Organic & Biomolecular Chemistry, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Kam, Toh-Seok, Pang, Huey-Shen, Lim, Tuck-Meng   +2 more
openaire   +3 more sources

Investigation of bisindole-linked pyrimidine moieties: synthesis using strantium–aluminum supported strontium aluminate nanophosphors catalyst, DNA reactivity, and in silico molecular docking studies

Nucleosides, Nucleotides & Nucleic Acids
In this communication, an innovative and straightforward protocol for the one-pot catalytic synthesis of bis(indolyl)pyrimidine derivatives and their DNA binding abilities is presented.
Hanumesh, M. K. Amshumali, P. Prachi, K. Yogendra, N. Madhusudhana, B. Vinay Kumar   +5 more
semanticscholar   +1 more source

Design and Catalytic Asymmetric Construction of Axially Chiral 3,3'-Bisindole Skeletons.

Angewandte Chemie, 2018
The first catalytic asymmetric construction of 3,3'-bisindole skeletons bearing both axial and central chirality has been established by organocatalytic asymmetric addition reactions of 2-substituted 3,3'-bisindoles with 3-indolylmethanols (up to 98 ...
Chun Ma, Fei Jiang, Feng‐Tao Sheng, Y. Jiao, Guang-Jian Mei, F. Shi   +5 more
semanticscholar   +1 more source

Schischkiniin support studies: synthetic access to 1,1′-bisindoles

Chem. Commun., 2013
The first general synthetic approach to 1,1'-bisindoles is described. Two simultaneous, ambient temperature Mori-Ban reactions were used to effect bisindolization of several diallylated hydrazobenzenes with minimal cleavage of the N-N bond.
Christy, Wang, Jonathan, Sperry
openaire   +2 more sources

Palladium-Catalyzed Cascade Heck Cyclization To Access Bisindoles

Organic Letters, 2018
A novel strategy for intercepting the σ-alkylpalladium species generated via a Heck reaction, enabling a palladium-catalyzed cyclization of o-ethynylanilines, has been described. This direct and operationally simple protocol provided a fundamental platform to synthesize bisindoles with high efficiency, involving one C-N bond and two C-C bond formations.
Kai Yuan, Lina Liu, Jiayi Chen, Songjin Guo, Hequan Yao, Aijun Lin   +5 more
openaire   +2 more sources

Chapter 4 Bisindole Alkaloids

2006
Publisher Summary This chapter provides an overview on bisindole alkaloids. The indole–indole and tryptamine–tryptamine type, and related alkaloids are discussed. Tryptamine–tryptamine type with an additional monoterpene unit and related alkaloids are briefly discussed.
openaire   +1 more source

New vobasinyl-ibogan type bisindole alkaloids from Tabernaemontana corymbosa

Fitoterapia, 2015
Ten vobasinyl-ibogan type bisindole alkaloids, including three new ones, tabercorines A-C (1-3), and a new natural product, 17-acetyl-tabernaecorymbosine A (4), were isolated from the twigs and leaves of Tabernaemontana corymbosa. Their structures were elucidated on the basis of spectroscopic data, and the NMR data of 17-acetyl-tabernaecorymbosine A (4)
Yu, Zhang, Lingli, Guo, Guangmei, Yang, Feng, Guo, Yingtong, Di, Shunlin, Li, Duozhi, Chen, Xiaojiang, Hao   +7 more
openaire   +2 more sources

Brønsted Acid-Catalyzed Regioselective (4+2) Cyclization of 2,3-Indolyldimethanols With 3-Vinylindoles for Synthesis of Bisindole-Fused Six-Membered Rings.

Chemistry
A regioselective (4+2) cyclization of 2,3-indolyldimethanols with 3-vinylindoles was established under the catalysis of Brønsted acids, leading to the efficient construction of structurally diverse bisindole-fused six-membered rings in overall good ...
Xian-Yang Yu, Yong-Bo Zhang, Hao Yu, Jing-Kai Wang, Ke Shi, Xinyan Guo, Shao‐Fei Ni, Wei Tan   +7 more
semanticscholar   +1 more source

Superior Efficacy of Selenium-Promoted Cobalt Titanate in Dual Catalysis: Bisindole Synthesis and Acetophenone Hydrogenation.

Langmuir
Non-metal-promoted metal titanates were synthesized using a novel surface-loading method, wherein varying weight percentages of non-metals (NMs (C, P, S, or Se)) were loaded onto preformed metal titanates, followed by calcination at their respective ...
B. Hariprasad, Sundaram Ganesh Babu
semanticscholar   +1 more source