Journal ArticleDOI
Unusual indole alkaloid-pyrrole, -pyrone, and -carbamic acid adducts from Alstonia angustifolia.
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TLDR
In this paper, three unusual natural products, viz., alstopirocine, a macroline alkaloid incorporating a substituted pyrrole moiety, pleiomaltinine, an alkaloidepyrone adduct, and pleiomalicine (pyrrole substituted with pleiocarpamine), were isolated from the Malayan Alstonia angustifolia.About:
This article is published in Tetrahedron.The article was published on 2010-09-25. It has received 38 citations till now. The article focuses on the topics: Alstonia angustifolia & Carbamic acid.read more
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Living on pyrrolic foundations – Advances in natural and artificial bioactive pyrrole derivatives
TL;DR: A summary and checklist of the most recent developments, indicating the classes of compounds, which have attracted the most significant research attention are contributed.
Journal ArticleDOI
Thiourea-Catalyzed Enantioselective Addition of Indoles to Pyrones: Alkaloid Cores with Quaternary Carbons
TL;DR: Arylpyrrolidino-derived thioureas catalyze the addition of indoles to pyrone-derived electrophiles with high stereoselectivity in the presence of catalytic quantities of an achiral Brønsted acid.
Journal ArticleDOI
Oxidized derivatives of macroline, sarpagine, and pleiocarpamine alkaloids from Alstonia angustifolia.
TL;DR: A total of 20 new indole alkaloid comprising mainly oxidized derivatives of macroline- (including alstofonidine, a macroline indole incorporating a butyrolactone ring-F), pleiocarpamine-, and sarpagine-type alkaloids were isolated from the bark and leaf extracts of Alstonia angustifolia.
Journal ArticleDOI
Straightforward Synthesis of Bridged Azaoxa Skeletons: Gold‐Catalyzed Aminoketalization of Garner’s Aldehyde‐Derived Alkynes
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Angustilobine and andranginine type indole alkaloids and an uleine-secovallesamine bisindole alkaloid from Alstonia angustiloba.
TL;DR: A total of 20 alkaloids were isolated from the leaf and stem-bark extracts of Alstonia angustiloba, of which two are hitherto unknown, and a bisindole alkaloid angustiphylline, derived from the union of uleine and secovallesamine moieties was established.
References
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Infrared Absorption Spectroscopy
Koji Nakanishi,Ulrich Meve,Alessandro Rapini,Sigrid Liede-Schumann,Uiara Catharina Soares e Silva,Ralph D. Mangelsdorff,Marc Nikolaus +6 more
BookDOI
Alkaloids : chemical and biological perspectives
TL;DR: In this paper, the total synthesis of amaryllidaceae alkaloids has been studied using radical cyclization reactions in total syntheses of naturally occurring indole alkaloid.
Journal ArticleDOI
Antiplasmodial activity of extracts and alkaloids of three Alstonia species from Thailand.
TL;DR: It has been found that the active alkaloids, in contrast to chloroquine, have significantly higher affinity to the K1 strain than to the T9-96 strain of Plasmodium falciparum.
Journal ArticleDOI
Synthesis of 8-heteroatom-substituted 4,4-difluoro-4-bora-3a, 4a-diaza-s-indacene dyes (BODIPY)
TL;DR: In this paper, the structures of the thioethers 6a-6c and compound 10a were determined by X-ray diffraction and they were better described by structure 10 than 7.
Journal ArticleDOI
Coumarins and γ-pyrone derivatives from Prangos pabularia: antibacterial activity and inhibition of cytokine release
Yukiko Tada,Yasuhiro Shikishima,Yoshihisa Takaishi,Hirofumi Shibata,Tomihiko Higuti,Gisho Honda,Michiho Ito,Yoshio Takeda,Olimjon K. Kodzhimatov,Ozodbek Ashurmetov,Yasukazu Ohmoto +10 more
TL;DR: The n-hexane and ethyl acetate extracts of the stems and the ethyl ethanol extracts of roots from Prangos pabularia afforded an gamma-pyrone derivative and furanocoumarin derivatives with three glucose and gamma- pyrone (pabularin A, B and C), along with 26 previously known compounds.