Ester Dienolate [2,3]-Wittig Rearrangement in Natural Product Synthesis: Diastereoselective Total Synthesis of the Triester of Viridiofungin A, A<sub>2</sub>, and A<sub>4</sub>
作者:Annett Pollex、Agnès Millet、Jana Müller、Martin Hiersemann、Lars Abraham
DOI:10.1021/jo0505270
日期:2005.7.1
3]-Wittig rearrangement was utilized to access the alkylated citric acid skeleton 6 that is characteristic for the viridiofungins and other members of the alkyl citrate family of secondary natural products. The [2,3]-sigmatropic rearrangement of (Z,Z)-15 provided the rearrangement product (±)-syn-16 in moderate yield and with very good diastereoselectivity. A Julia−Kocienski olefination efficiently served