Jozipeltine A, a Novel, Unnatural Dimer of the Highly Hydroxylated Naphthylisoquinoline Alkaloid Dioncopeltine A
摘要:
The synthesis of jozipeltine A (5), the 6'-coupled constitutionally symmetric dimer of the highly antimalarial naphthylisoquinoline alkaloid dioncopeltine A (4), is described. After selective protection of two of the four OH- and NH-functionalities of 4, the coupling succeeds oxidatively, with Ag2O as the reagent. Deprotection gives the target molecule 5, in only three steps from 4. Jozipeltine A is the first naphthylisoquinoline dimer with oxygen functions in the side chain of the naphthalene part. Investigations on its antiplasmodial and antiviral activities provide valuable insight into structure-activity relationships within this promising class of bioactive quateraryls. (C) 2000 Elsevier Science Ltd. All rights reserved.
5′-O-demethyldioncophylline A, a new antimalarial alkaloid from triphyophyllum peltatum1Part 111 in the series “Acetogenic Isoquinoline Alkaloids”. For Part 110, see Ref.[1].1
From the root bark of Triphyophyllum peltatum, the new naphthylisoquinoline alkaloid 5'-O-demethyldioncophylline A has been isolated. Its otherwise difficult separation from the largely dominating main alkaloid, dioncophylline A, was greatly facilitated by a bromination-benzylation procedure. From the resulting derivative, a crystal structure analysis with an anomalous X-ray diffraction was achieved
从三叶草的根皮中,分离出新的萘基异喹啉生物碱 5'-O-去甲基二羟甲基二苯酚 A。溴化-苄基化程序极大地促进了它与主要的主要生物碱,二酮茶碱 A 的分离。从所得衍生物中,通过异常 X 射线衍射实现了晶体结构分析,从而证实了新生物碱的完整绝对立体结构。该结构进一步由 diioncopeltine A 的部分合成证实。该天然产物显示出对恶性疟原虫红细胞形式的抗疟活性。
ASYMMETRIC SYNTHESIS OF (M)-2-HYDROXYMETHYL-1-(2-HYDROXY-4,6-DIMETHYLPHENYL)NAPHTHALENE VIA A CONFIGURATIONALLY UNSTABLE BIARYL LACTONE
作者:Bringmann, Gerhard、Breuning, Matthias、Henschel, Petra、Hinrichs, Jürgen、Greenen, Peter M.、Curran, Dennis P.
DOI:10.15227/orgsyn.079.0072
日期:——
BRINGMANN, GERHARD;RUBENACKER, MARTIN;VOGT, PETER;BUSSE, HOLGER;AKE, ASSI+, PHYTOCHEMISTRY, 30,(1991) N, C. 1691-1696
Dioncopeltine A and dioncolactone A: Alkaloids from Triphyophyllum peltatum
作者:Gerhard Bringmann、Martin Rübenacker、Peter Vogt、Holger Busse、Laurent Aké Assi、Karl Peters、Hans Georg von Schnering
DOI:10.1016/0031-9422(91)84235-k
日期:1991.1
The isolation of two novel alkaloids from Triphyophyllum peltatum is described. The complete stereostructure of dioncopeltine A, which is closely related to dioncophylline A, is established by spectroscopic, chiroptical, and degradative methods, and is furthermore confirmed by its transformation to O-methyl-dioncopophylline A, as well as by X-ray crystallography. Dioncolactone A, which can be transformed into dioncopeltine A by reductive ring-opening, is the first naturally occurring representative of this novel type of 'axially prostereogenic' biaryl alkaloids.