Synthesis of aspergillide A from a synthetic intermediate of aspergillide B
作者:Tomohiro Nagasawa、Shigefumi Kuwahara
DOI:10.1016/j.tetlet.2009.12.032
日期:2010.2
The first synthesis of aspergillide A, a cytotoxin produced by a marine-derived fungus, has been achieved from a synthetic intermediate of aspergillideB by using a proline-mediated epimerization of a 2,6-trans-substituted tetrahydropyran-2-acetaldehyde intermediate into the corresponding cis-isomer via a retro-oxy-Michael/oxy-Michael sequence as the key transformation.
The transformation of a common synthetic intermediate of aspergillides B and C into aspergillide A, a cytotoxin produced by a marine-derived fungus, has been accomplished in an eleven-step sequence involving an efficient proline-catalyzed isomerization of a 2,6-trans-substituted tetrahydropyran-2-acetaldehyde intermediate into the corresponding cis isomer and the Yamaguchi macrolactonization as the key steps. (C) 2011 Elsevier Ltd. All rights reserved.