We were able to show the predominant incorporation of a single enantiomer and intact incorporation of multiply labelled synthetic diketide precursors (14 and 16), which established the intermediacy of cyclopropanated diketide and led to our proposal for the unprecedented biological cyclopropanation, viaPKS (polyketide synthase) having a novel cyclopropanase domain, in the biosynthesis of FR-900848 (1).
δ-Deuterium Isotope Effects as Probes for Transition-State Structures of Isoprenoid Substrates
作者:Seoung-ryoung Choi、Martin Breugst、Kendall N. Houk、C. Dale Poulter
DOI:10.1021/jo500394u
日期:2014.4.18
The biosynthetic pathways to isoprenoid compounds involve transfer of the prenyl moiety in allylic diphosphates to electron-rich (nucleophilic) acceptors. The acceptors can be many types of nucleophiles, while the allylic diphosphates only differ in the number of isoprene units and stereochemistry of the double bonds in the hydrocarbon moieties. Because of the wide range of nucleophilicities of naturally