First Total Synthesis of Symbioramide, a Novel Ca<sup>2+</sup>-ATPase Activator from<i>Symbiodinium</i>sp.
作者:Masako Nakagawa、Jun Yoshida、Tohru Hino
DOI:10.1246/cl.1990.1407
日期:1990.8
The first total synthesis of symbioramide (1) is described and simultaneously established the complete stereostructure of 1 to be (2S,3R,2′R,3′E)-N-(2′-hydroxy-3′-octadecenoyl)-dihydrosphingosine.
concise, enantioselective total synthesis of symbioramide, starting from simple achiral compounds and racemic α-amino-β-keto esterderivatives is reported. This highly flexible strategy allowed the efficient preparation of seven structural isomers of the natural product as well. The synthesis relies on a convergent route that involves the efficient stereoselective reduction of a α-keto-β-yne ester, and
A concise synthesis of symbiorarnide, a marine-origin ceramide from a common starting material, methyl (+/-)-trans-2,3epoxyoctadecanoate, in a convergent manner was achieved. The key step is the direct lipase-catalyzed coupling reaction between methyl (2R,3E)-2-hydroxy-3-octadecenoate and non-protected (+/-)-erythro-dihydrosphingosine, giving natural (2S,3R,2 ' R)-symbioramide and its (2R,3S,2 ' R)-isomer in 38% and 37% yield, respectively. The optically active beta,gamma-unsaturated alpha-hydroxyester was prepared by Mg(ClO4)(2)-inediated isomerization of epoxide and the subsequent lipase PS-catalyzed kinetic resolution. (c) 2005 Elsevier Ltd. All rights reserved.