Using NMR to determine the relative stereochemistry of 7,7-diaryl-8,8′-dimethylbutan-1-ol lignans
作者:Samuel J. Davidson、Claire E. Rye、David Barker
DOI:10.1016/j.phytol.2015.09.014
日期:2015.12
Due to their linear, freely rotatable, structure many natural 7,7-diaryl-8,8'-dimethylbutan-7'-ol lignans are reported without any stereochemical assignment. Analysis of synthetic 8,8'-dimethylbutanol lignans and analogues reveals significant differences between the NMR data of syn-and anti-isomers. This information was then used to determine the relative stereochemistry of the C-8 and C-8' methyl groups in previously undefined natural products. (C) 2015 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.
Takamatsu, Masanori; Terao, Yoshiyasu; Sekiya, Minoru, Chemical and pharmaceutical bulletin, 1982, vol. 30, # 8, p. 2682 - 2687
(E)-N-(3-lithio-3-tosyl-2-propenyl)morpholine: A new vinylic γ-aminated organolithium compound
作者:Pedro L. Ibáñez、Carmen Nájera
DOI:10.1016/s0040-4039(00)91987-7
日期:1993.3
The lithiation of (E)-N-(3-tosyl-2-propenyl)morpholine (3) with sec-butyllithium at -78-degrees-C takes place in the vinylic position to give the corresponding gamma-functionalized organolithium compound 4. The further reaction of this anion with electrophiles (deuterium oxide, alkyl halides and carbonyl compounds) afforded regio- and stereo-selectively tosylated gamma-functionalized allylmorpholine derivatives 6. Alkylated compounds 6b-d are reduced with samarium-(II) iodide to lead the corresponding allylic amines 8 mainly with Z configuration.
Reaction of ethyl diazoacetate with allylamines catalyzed by copper and rhodium complexes
作者:U. M. Dzhemilev、R. N. Fakhretdinov、R. M. Marvanov、O. M. Nefedov
DOI:10.1007/bf00995692
日期:1984.3
Regio- and stereospecific synthesis of allylic tertiary amines
作者:David Cavalla、Stuart Warren
DOI:10.1016/s0040-4039(00)85639-7
日期:1982.1
E and Z allylic amines have been synthesised by stereo-specific elimination of Ph2PO2− from pure diastereoisomers (3) and (4).