Journal ArticleDOI
Nuclear magnetic resonance spectra, configuration and conformation of diastereomers—II : Ethyl esters of 3-substituted 2,3-diphenylpropanoic acids: Magnetic nonequivalence induced by two asymmetric centres
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TLDR
The NMR spectra of the erythro and threo forms of the esters PhCH a XCH b (Ph)COOC 2 H 5, where X = OH, NH 2, NHPh, and NHCONH 2 have been investigated in CDCl 3, DMSO-d 6, benzene and pyridine solutions as discussed by the authors.About:
This article is published in Tetrahedron.The article was published on 1971-01-01. It has received 21 citations till now. The article focuses on the topics: NMR spectra database & Conformational isomerism.read more
Citations
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Anti-plasmodial and cholinesterase inhibiting activities of some constituents of Psorospermum glaberrimum.
Bruno Ndjakou Lenta,Bruno Ndjakou Lenta,Krishna Prasad Devkota,Krishna Prasad Devkota,Silvère Ngouela,Fabrice Fekam Boyom,Quamar Naz,Muhammad Iqbal Choudhary,Etienne Tsamo,Philip J. Rosenthal,Norbert Sewald +10 more
TL;DR: The extracts and the isolated compounds were tested in vitro for their anti-plasmodial activity against Plasmodium falciparum (chloroquine resistant strain W2) and for their acetyl- and butyrylcholinesterase inhibitory properties.
Journal ArticleDOI
Stereochemie der Claisen-Umlagerung mit 1-Dimethylamino-1-methoxy-propen-(1)
Wolfgang Sucrow,W. Richter +1 more
TL;DR: In this article, a chair-like transition state with Z-configuration of the ketene O.N-acetal double bond was observed, which cannot be observed directly.
Journal ArticleDOI
Polygonumnolides C1-C4; minor dianthrone glycosides from the roots of Polygonum multiflorum Thunb.
Jian-Bo Yang,Li Li,Zhong Dai,Yu Wu,Xing-chao Geng,Bo Li,Shuang-Cheng Ma,Ai-Guo Wang,Ya-Lun Su +8 more
TL;DR: Four new dianthrone glycosides, named polygonumnolides C1-C4 (1–4), were isolated from the dried roots of Polygonum multiflorum Thunb and showed weak hepatotoxicity against L-02 cell lines.
Journal ArticleDOI
An improved method for the generation of imines and enamides. Application to the synthesis of 3-arylisoquinoline derivatives
TL;DR: In this article, the Bischler-Napieralski reaction of 1,2-diarylethylamines and their transformation into 12-methyl substituted benzo[c]phenanthridines has been developed.
Journal ArticleDOI
Polygonumnolides A1–B3, minor dianthrone derivatives from the roots of Polygonum multiflorum Thunb
Jian-Bo Yang,Zheng Yan,Jin Ren,Zhong Dai,Shuang-Cheng Ma,Shuang-Cheng Ma,Ai-Guo Wang,Ya-Lun Su +7 more
TL;DR: Seven new dianthrone glycosides, named polygonumnolides A1–B3 (1–7), were isolated from the 70 % EtOH extract of the dried roots of Polygonum multiflorum Thunb using column chromatography and preparative high-performance liquid chromatography.
References
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The Stereochemistry of the Ivanov and Reformatsky Reactions. I
Journal ArticleDOI
Dependency of Vicinal Coupling Constants on the Configuration of Electrongegative Substituents
Journal ArticleDOI
Nuclear Magnetic Resonance Spectroscopy. The Effect of Structure on Magnetic Nonequivalence Due to Molecular Asymmetry
TL;DR: In this article, the difference in chemical shift between the methylene protons of a number of compounds related structurally to 1-phenylethyl benzyl ether has been measured.
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