Chemo-enzymatic short-step total synthesis of symbioramide
摘要:
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.
Study of the Cross-Metathesis Reaction of α-Hydroxy β,γ-Unsaturated Amides towards a Rapid and Flexible Total Synthesis of Symbioramide and its Isomer
作者:Alexandre Gratais、Samir Bouzbouz
DOI:10.1055/s-0036-1588579
日期:2018.1
The reactivity of novel α-hydroxy β,γ-unsaturated amides in cross-metathesis reactions was extensively studied and used to perform a short total synthesis of symbioramide and its isomer from l -serine methyl ester.