Chiral Synthesis of a Pyrrolizidine Alkaloid, (-)-Heliotridane
摘要:
Chiral synthesis of the necic base, heliotridane has been achieved by employing a samarium diiodide-promoted regioselective carbon-carbon bond cleavage reaction of the gamma-halo ester (17), as a key step.
Samarium(<scp>II</scp>) iodide promoted reductive fragmentation of γ-halo carbonyl compounds: application to the enantiospecific synthesis of (–)-oudemansin A
The reductive regioselective bond-cleavage reaction of γ-halo carbonyl compounds with samarium(II) iodide is developed and its utilisation in the enantiospecific synthesis of (–)-oudemansin A is described.