Total Syntheses of D-xylo- and D-arabino-Phytosphingosine Based on the Syntheses of Chiral 1,3-Oxazines
作者:Yu Mu、Tian Jin、Gun-Woo Kim、Jin-Seok Kim、Sung-Soo Kim、Yong-Shou Tian、Chang-Young Oh、Won-Hun Ham
DOI:10.1002/ejoc.201200064
日期:2012.5
An efficient, stereocontrolled, and short synthetic method for the preparation D-xylo- and D-arabino-phytosphingsine was achieved utilizing chiral oxazines. The key features of this strategy are the stereoselective intramolecular oxazine formation catalyzed by palladium(0) and an intermolecular olefin cross-metathesis reaction.
A library of 64 phytosphingolipid analogues resulting from the systematic variation of the C1, C3, C4, and the N-acyl moiety of phytosphingosine (PHS) has been prepared from common scaffolds derived from the chiral pool and Sharpless asymmetric dihydroxylation reactions. Library members have been evaluated as growth inhibitors of the yeast Saccaromyces cerevisiae. In addition, 1-amino-N-pivaloyl PHS analogues were also tested as IPC synthase inhibitors, in comparison with the natural product khafrefungin.
A direct organocatalytic entry to sphingoids: asymmetric synthesis of d-arabino- and l-ribo-phytosphingosine
作者:Dieter Enders、Jiří Paleček、Christoph Grondal
DOI:10.1039/b515007h
日期:——
The organocatalytic asymmetric synthesis of D-arabino- and L-ribo-phytosphingosine is described employing a diastereo- and enantioselective (S)-proline-catalyzed aldolreaction of 2,2-dimethyl-1,3-dioxan-5-one and pentadecanal as the key step.
A short synthesis of the phytosphingosine derivatives and their stereoisomers by using asymmetric dihydroxylation of the optically active olefins derived from l-serine is described.
Efficient Enantioselective Total Synthesis of<i>arabino</i>-Phytosphingosine
作者:Yong Hae Kim、Doo Young Jung、Sol Kang、Suk Bok Chang
DOI:10.1055/s-2005-872242
日期:——
Enantioselectivetotalsynthesis of arabino-phytosphingosine has been achieved in 8 steps employing Claisen rearrangement and Fleming-Tamao oxidation as key steps. Installation of all chiral centers present in arabino-phytosphingosine was achieved through the use of asymmetric catalysis. This synthesis provides one of the most efficient routes to prepare 2-amino-1,3,4-triol moiety.