Synthesis of C-linked α-Gal and α-GalNAc-1'-hydroxyalkanes by way of C2 functionality transfer

Formal Synthesis of Fostriecin via Asymmetric Alcohol-Mediated Carbonyl Allylation

A formal synthesis of fostriecin via convergent assembly of two fragments prepared via asymmetric alcohol-mediated C-C coupling is described. One fragment is made by the enantioselective iridium-catalyzed allylation of an allylic alcohol mediated by allyl acetate. The other fragment is made via enantioselective ruthenium-catalyzed reductive syn-(α-alkoxy)allylation of an aldehyde mediated by an alkoxyallene (where 2-propanol is the hydrogen source), representing the first use of this method in target-oriented synthesis. Metathetic fragment union enables interception of a late-stage compound that previously required a 25 step (LLS) synthesis in only 7 steps (LLS).