Method for determination of enantiomeric composition and absolute configuration of 2,3-deuterated 3-alkylpropanols
作者:Jun Furukawa、Shigeo Iwasaki、Shigenobu Okuda
DOI:10.1016/s0040-4039(00)88411-7
日期:1983.1
Assignments were made for diastereoptopic methyleneprotons on C-2 and C-3 of 1-phenyl-3-alkylpropanols in Eu(fod)3-enhanced 1H-NMR spectra to develope a generally applicable method to determine enantiomeric composition and absolute configuration of 2 and/or 3-deuterated 3-alkylpropanols.
Synthesis of (4R,5R)-muricatacin and its (4R,5S)-analog by sequential use of the photo-induced rearrangement of epoxy diazomethyl ketones
作者:Marcel P.M. van Aar、Lambertus Thijs、Binne Zwanenburg
DOI:10.1016/0040-4020(95)00670-4
日期:1995.10
The naturally occurring δ-hydroxy-γ-lactone (4R,5R)-muricatacin and its nonnatural (4R,5S)-analog are synthesized. The starting achiral allylic alcohols are converted into α,β-epoxy diazomethylketones followed by a stereospecific irradiation reaction of these compounds to give 4-hydroxy-2-alkene esters. Using this method in a sequential manner a successive introduction of stereogenic centers is realized
1,3-Transposition of primary allylic alcohols: Synthesis of optically active secondary and tertiary allylic alcohols
作者:Rosa L. Dorta、María S. Rodríguez、JoséA. Salazar、Ernesto Suárez
DOI:10.1016/s0040-4039(97)00964-7
日期:1997.6
The reduction of opticallyactive 2,3-epoxy alcohols, suitably prepared by the Sharpless asymmetric epoxidation of primary allylic alcohols, with the system triphenylphosphine/iodine/imidazole/2,6-lutidine/water, leads in a single step to opticallyactive secondary and tertiary allylic alcohols.
Synthesis of 6-Hydroxysphingosine and α-Hydroxy Ceramide Using a Cross-Metathesis Strategy
作者:Patrick Wisse、Mark A. R. de Geus、Gen Cross、Adrianus M. C. H. van den Nieuwendijk、Eva J. van Rooden、Richard J. B. H. N. van den Berg、Johannes M. F. G. Aerts、Gijsbert A. van der Marel、Jeroen D. C. Codée、Herman S. Overkleeft
DOI:10.1021/acs.joc.5b00823
日期:2015.7.17
In this paper, a new synthetic route toward 6-hydroxysphingosine and alpha-hydroxy ceramide is described. The synthesis employs a cross-metathesis to unite a sphingosine head allylic alcohol with a long-chain fatty acid alkene that also bears an allylic alcohol group. To allow for a productive CM coupling, the sphingosine head allylic alcohol was protected with a cyclic carbonate moiety and a reactive CM catalyst system, consisting of Grubbs II catalyst and CuI, was employed.
The first total synthesis of the 6-hydroxy-4E-sphingenines
Ceramides containing the 6-hydroxy-4E-sphingenines, previously unknown long-chain bases, have recently been found in human skin. A total synthesis of 6-hydroxy-4E-sphingenines has been achieved. (C) 2003 Elsevier Science Ltd. All rights reserved.