Lewis acid-catalyzed stereospecific ring expansion of aziridine-2-carboxylates to imidazolidin-2-ones
作者:Min Sung Kim、Yong-Woo Kim、Heung Sik Hahm、Jae Won Jang、Won Koo Lee、Hyun-Joon Ha
DOI:10.1039/b503750f
日期:——
Lewis acid-catalyzedringexpansion reaction of chiral aziridine-2-carboxylate proceeds regio- and stereospecifically to yield enantiomerically pure 4-functionalized imidazolidin-2-ones in high yields.
[EN] SPHINGOLIPID DERIVATIVES AND THE COMPOSITION FOR ANTI-CANCER CONTAINING THE SAME<br/>[FR] DERIVES DE SPHINGOLIPIDES ET COMPOSITION ANTICANCEREUSE CONTENANT LESDITS DERIVES
申请人:DOOSAN CORP
公开号:WO2006004359A1
公开(公告)日:2006-01-12
Disclosed are a novel sphingolipid derivative having a sphingosine kinase suppressing activity and a composition containing the same. When the newly synthesized sphingolipid derivative of the invention is used, it is possible to maintain concentrations of ceramide and sphingosine to be high by preventing ceramide and sphingosine from being phosphorylated due to sphingosine kinase since an activity of sphingosine kinase is suppressed. In addition, since the apoptosis is induced in a cancer cell by ceramide and sphingosine, it is possible to treat or prevent a cancer or disease related to the cancer. Further, it is possible to treat or prevent a hyper- proliferative disease such as cancer or proliferation-promoting activity of sphingosine kinase. Accordingly, the composition containing the same can be used as a composition for suppressing sphingosine kinase and a composition for treating or preventing a cancer or hyper-proliferative disease.
A formal synthesis of enantiomerically pure (-)-swainsonine was successfully achieved using intramolecular cyclization of the amino alcohol 4 which was derived from a readily available 1-(R)-alpha-methylbenzylaziridine-2-carboxylic acid (-)-menthol ester 6. (C) 2010 Elsevier Ltd. All rights reserved.
A Novel Synthesis of 5-Functionalized Oxazolidin-2-ones from Enantiomerically Pure 2-Substituted <i>N</i>-[(<i>R</i>)-(+)-α-Methylbenzyl]aziridines
作者:Tae Bo Sim、Se Hun Kang、Kun Su Lee、Won Koo Lee、Hoseop Yun、Yongkwan Dong、Hyun-Joon Ha
DOI:10.1021/jo0261911
日期:2003.1.1
5-Funtionalized enantiomerically pure oxazolidin-2-ones were prepared in one pot from commercially available chiral aziridines bearing an electron-withdrawing group at C-2 with retention of the configuration in high yields by regioselective aziridine ring-opening followed by intramolecular cyclization.