The structures of the six-coordinate Fe(III) and Ga(III) complexes of the cyclic 6- and 7-membered hydroxamicacids PIPOH and AZEPOH found in several mixed-ligand siderophores are intermediate between the octahedron (OC) and the trigonal prism (TPR). The coordination geometries of [M(AZEPO)]3 are very close to OC, whereas the coordination geometry of the [Fe(PIPO)3] complex is half-way between OC and
A prodrug system for hydroxylamines based on esterase catalysis
作者:Ana Conejo-Garcia、Christopher J. Schofield
DOI:10.1016/j.bmcl.2005.06.026
日期:2005.9
The synthesis and reactivity of hydroxy hydroxamates as models for a prodrug form of hydroxylamine are described. gamma-Hydroxy hydroxamates were found to enable hydroxylamine release via lactonisation. Hydroxamates were found to undergo esterase catalysed hydrolysis. (c) 2005 Elsevier Ltd. All rights reserved.
Photochemical Rearrangement of <i>N</i>-Mesyloxylactams: Stereospecific Formation of <i>N</i>-Heterocycles
作者:Alexandre Drouin、Dana K. Winter、Simon Pichette、Samuel Aubert-Nicol、Jean Lessard、Claude Spino
DOI:10.1021/jo101805q
日期:2011.1.7
N-Mesyloxylactams undergo an efficient ring-contraction to N-heterocycles of various ring sizes. Yields increase with the degree of substitution α to the carbonyl. The stereochemical information of a chiral migrating carbon is conserved making this reaction a synthetically useful complement to the well-known Hofmann, Curtius, Lossen, and Schmidt rearrangements.