Asymmetric total syntheses of spisulosine, its diastereo- and regio-isomers
作者:Subal Kumar Dinda、Sajal Kumar Das、Gautam Panda
DOI:10.1016/j.tet.2010.09.018
日期:2010.11
divergent stereoselective syntheses of spisulosine and its diastereo- and regio-isomers have been achieved. In the Sharpless asymmetric dihydroxylation-based approach, the keystep is the synthesis of monoprotected diol, whereas Miyashita’s boron-directed C-2 regioselective azidolysis of enantiomerically pure epoxy alcohol is the vital step in the Sharpless asymmetric epoxidation-based route. The
Straightforward Access to Spisulosine and 4,5-Dehydrospisulosine Stereoisomers: Probes for Profiling Ceramide Synthase Activities in Intact Cells
作者:José Luis Abad、Ingrid Nieves、Pedro Rayo、Josefina Casas、Gemma Fabriàs、Antonio Delgado
DOI:10.1021/jo400440z
日期:2013.6.21
A stereoselective synthesis of spisulosine (ES285) and 4,5-dehydrospisulosine stereoisomers is described. Hydrozirconation of 1-pentadecyne with Schwartz reagent, followed by diastereocontrolled addition to L- or D-alaninal afforded the required 2-amino-1,3-diol framework. The resulting sphingoid bases revealed as excellent probes for the profiling of ceramide synthase activity in intact cells. Among the sphingoid bases described in this work, spisulosine (ES285), RBM1-77, and RBM1-73 were the most suitable ones because of their highest acylation rates. These molecules should prove useful to study the role of the different ceramide synthases and the resulting N-acyl (dihydro)ceramides in cell fate.
Prostenik; Alaupovic, Croatica Chemica Acta, 1957, vol. 29, p. 393,400