Synthesis of Deuterium-Labeled Derivatives of Dimethylallyl Diphosphate
摘要:
Short practical syntheses for five deuterium-labeled derivatives of dimethylallyl diphosphate (DMAPP) useful for enzymological studies are reported. These include the preparation of the Cl-labeled derivatives (R)-[1-H-2]3-methylbut-2-enyl diphosphate ((R)-[1-H-2]1-OPP) and (S)-[1-H-2]3-methylbut-2-enyl diphosphate ((S)-[1-H-2]1-OPP), the C2-labeled derivative [2-H-2]3-methylbut-2-enyl diphosphate ([2-H-2]1-OPP), and the methyl-labeled derivatives (E)-[4,4,4-H-2(3)]3-methylbut-2-enyl diphosphate ((E)-[4,4,4-H-2(3)]1-OPP) and (Z)-[4,4,4-H-2(3)]3-methyl-but-2-enyl diphosphate ((Z)[4,4,4-H-2(3)]1-OPP).
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
Aerobic C−N Bond Formation through Enzymatic Nitroso‐Ene‐Type Reactions**
作者:Christina Jäger、Mona Haase、Katja Koschorreck、Vlada B. Urlacher、Jan Deska
DOI:10.1002/anie.202213671
日期:2023.2.6
laccases participate in C−N bond-forming reactions through the generation of reactive nitroso intermediates from acylated hydroxylamines. The formal allylic C−H bond activation proceeds with air as the terminal oxidant and provides high yields both in intramolecular and intermolecular aminationreactions through this unprecedented biocatalytic nitroso-ene-type reaction pathway.