Stereocontrolled Synthesis of a C<sup>1</sup>-C<sup>10</sup>Building Block (“Southwestern Moiety”) for the Unnatural Enantiomers of the Polyene Polyol Antibiotics Filipin III and Pentamycin: A Sultone-Forming Ring-Closing Metathesis for Protection of Homoallylic Alcohols
作者:Patrick Walleser、Reinhard Brückner
DOI:10.1002/ejoc.201400145
日期:2014.5
The twofold ring‐closing metathesis of homoallyl crotonate and homoallyl ethenesulfonate intermediate A gave unsaturated lactone and sultone containing intermediate B. The lactone was modified by diastereoselective 1,4‐addition of a silyl cuprate and the sultone was removed to deliver a homoallylic alcohol that iodocarbonatized cis‐selectively (→ C). A diastereoselective aldolization followed (→ → D)
高烯丙基,巴豆酸和高烯丙基ethenesulfonate中间的双重闭环复分解甲得到不饱和内酯和含有磺内酯中间体乙。内酯通过非对映选择性的1,4-加成甲硅烷基铜酸酯改性,然后除去磺内酯以提供碘代碳酸化顺式(→ C)的均丙醇。随后进行非对映选择性醛醇缩合(→→ D)。