A concise synthesis of pinellic acid using a cross-metathesis approach
作者:Ayako Miura、Shigefumi Kuwahara
DOI:10.1016/j.tet.2009.02.063
日期:2009.4
A new enantioselective synthesis of pinellic acid, a trihydroxy unsaturated fatty acid exhibiting oral adjuvant activity for nasally administered influenza vaccine, has been accomplished using a cross-metathesis reaction between two terminal olefin intermediates as the key step. This synthesis is the shortest to date, furnishing pinellic acid in 17% overall yield via only seven steps from a readily available known dihydroxy ester. (C) 2009 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of malyngic acid and fulgidic acid
A new stereoselective total synthesis of malyngic acid has been achieved from a known oxazolidinone derivative via eight steps involving the Evans asymmetric alkylation as the chirality-inducing step and chelation-controlled Zn(BH4)2 reduction of an α-hydroxy ketone intermediate for the installation of the 12,13-anti stereochemistry. Fulgidic acid, the C12-epimer of malyngic acid, has also been synthesized
A concise approach to both enantiomers of phytoprostane B1 type II
作者:Wiesława Perlikowska、Marian Mikołajczyk
DOI:10.1016/j.tetasy.2011.10.005
日期:2011.10
The synthesis of enantiomeric phytoprostane B1 type II methyl esters has been accomplished in approximately 30% overall yield via two basic transformations starting from 3-[(dimethoxyphosphoryl)methyl]cyclopentenone as a key reagent. They include ethylation of the ring C(2) carbon and a Horner olefination reaction using the phosphonate moiety at C(3). The novel components of the Horner reaction, the