Synthesis of Isoxazolin-5-one Glucosides by a Cascade Reaction
作者:Tobias Becker、Helmar Görls、Gerhard Pauls、Roland Wedekind、Marco Kai、Stephan H. von Reuß、Wilhelm Boland
DOI:10.1021/jo4023155
日期:2013.12.20
A novel synthetic route was developed for the construction of isoxazolin-5-one glucosides using a cascade reaction. An X-ray crystal structure analysis of a isoxazolin-5-one glucoside confirmed the structure and stereochemistry of the heterocycle. The properties of the α- and β-anomers of the isoxazolin-5-one glucosides were compared. The first synthesis of 2-[6′-(3″-nitropropanoyl)-β-d-glucopyran
Biosynthesis of isoxazolin-5-one and 3-nitropropanoic acid containing glucosides in juvenile Chrysomelina
作者:Tobias Becker、Kerstin Ploss、Wilhelm Boland
DOI:10.1039/c6ob00899b
日期:——
(3-NPA) ester 2 in Chrysomelina larvae. Both structural elements originate from sequestered plant-derived β-alanine or from propanoyl-CoA that is derived from the degradation of some essential amino acids, e.g. valine. β-Alanine is converted into 3-NPA and isoxazolinone 5 by consecutive oxidations of the amino group of β-Ala. Substituting the diphospho group of α-UDP-glucose with 5 generates the isoxazolin-5-one