Results 161 to 170 of about 971 (184)

A partial synthesis of the Alstonia bisindole alkaloid villalstonine

Tetrahedron Letters, 1994
Abstract The partial synthesis of villalstonine 1 has been completed by coupling the macroline equivalent 2a with plant-derived (+)-pleiocarpamine 3 in 0.2N aq. hydrochloric acid in the presence of fluoride ion.
Yingzhi Bi, James M. Cook, Philip W. LeQuesne   +2 more
openaire   +1 more source

Biomimetic synthesis and structure of the bisindole alkaloid alstonisidine

Journal of the Chemical Society, Chemical Communications, 1972
Alstonisidine, a bisindole alkaloid from Alstonia muelleriana, is assigned the revised structure (II) on the basis of its biomimetic synthesis from quebrachidine (III) and macroline (IV).
David E. Burke, James M. Cook, P. W. Le Quesne   +2 more
openaire   +1 more source

Vincazalidine A, a unique bisindole alkaloid from Catharanthus roseus

Journal of Natural Medicines
A new dimeric indole alkaloid, vincazalidine A consisting of an aspidosperma type and a modified iboga type with 1-azatricyclo ring system consisting of one azepane and two piperidine rings coupled with an oxazolidine ring was isolated from Catharanthus roseus, and the structure including absolute stereochemistry was elucidated on the basis of ...
Yusuke, Hirasawa, Ayaka, Kase, Akie, Okamoto, Keigo, Suzuki, Mizuki, Hiroki, Toshio, Kaneda, Nahoko, Uchiyama, Hiroshi, Morita   +7 more
openaire   +2 more sources

New Bisindole Alkaloids from Tabernaemontana corymbosa

Journal of Natural Products, 2002
Ten new bisindole alkaloids of the vobasinyl-ibogan type, viz., conodiparines A-F (1-6), conodutarines A and B (7, 8), and cononitarines A and B (9, 10), were obtained from the leaf extract of the Malayan species Tabernaemontana corymbosa. The structures were determined using NMR and MS analysis.
Toh-Seok, Kam, Kooi-Mow, Sim, Huey-Shen, Pang   +2 more
openaire   +2 more sources

Aspidospermatan–aspidospermatan and eburnane-sarpagine bisindole alkaloids from Leuconotis

Phytochemistry, 2010
Leucofoline and leuconoline, representing the first members of the aspidospermatan-aspidospermatan and eburnane-sarpagine subclasses of the bisindole alkaloids, respectively, were isolated from the Malayan Leuconotis griffithii. The structures of these bisindole alkaloids were established using NMR and MS analysis, and in the case of leuconoline ...
Gan, Chew Yan, Low, Yun Yee, Robinson, W.T., Komiyama, K., Kam, Toh Seok   +4 more
openaire   +3 more sources

Synthesis and Assignment of the Absolute Configuration of Indenotryptoline Bisindole Alkaloid BE-54017

Organic Letters, 2012
Synthesis of the indenotryptoline bisindole alkaloid, BE-54017, was accomplished using osmium-promoted cis-dihydroxylation of maleimide as a key step. After optical resolution, the absolute configuration of this molecule was determined by comparing its optical rotation and HPLC profile to those obtained for BE-54017 derived from enantiopure ...
Tomoyuki, Kimura, Shuhei, Kanagaki, Yusuke, Matsui, Masaya, Imoto, Takumi, Watanabe, Masakatsu, Shibasaki   +5 more
openaire   +2 more sources

Syntheses of the Bisindole Alkaloids of the Genera Borreria and Flindersia

2014
Abstract The flinderoles and their structural isomers, the borreverines, have intriguing chemical structures and promising biological activity. These indole alkaloids each contain multiple stereocenters that challenge synthetic chemists to develop new reaction methods. Proven antimalarial activity further established the synthesis of these targets as
openaire   +1 more source

Nitaphylline, A New Bisindole Alkaloid fromKopsia

Natural Product Research, 1997
Toh-Seok Kam, K Yoganathan
exaly  

Antiviral enantiomers of a bisindole alkaloid with a new carbon skeleton from the roots of Isatis indigotica

Chinese Chemical Letters, 2015
Yu-Feng Liu, Ming-Hua Chen, Qing-Lan Guo   +2 more
exaly  

Racemosin C, a novel minor bisindole alkaloid with protein tyrosine phosphatase-1B inhibitory activity from the green alga Caulerpa racemosa

Journal of Asian Natural Products Research, 2014
Hui Yang, Xiao-Qing Yu, Shui-Chun Mao
exaly