Imide–amide rearrangement of oxazaphosphorimidates: studies towards the application to the synthesis of chiral Lewis bases
作者:Eurico J. Cabrita、Carlos A.M. Afonso、A. Gil Santos
DOI:10.1016/j.tet.2004.09.079
日期:2004.12
oxazaphosphorimides are prepared in situ by the Staudinger reaction of the appropriate trivalent phosphorus compound with an azide and after the addition of BF3·OEt2, undergo rearrangement to the corresponding diazaphosphoramides. We have found that the rearrangement occurs with retention of configuration at the phosphorus atom and inversion of configuration at the rearranged carbon atom. When starting from chiral
Copper(II) complexes with optically active diamines. I. Synthesis and properties of copper(II) complexes wit N-benzyl andN-methyl derivatives of 1, 2-diaminopropane
the electrical conductivity, magnetic susceptibility and absorption spectra of their compelexes with copper. As distict from α-amino acid complexes, where the insertion of N-alkyl substituents results in their structure being changed from distorted octahedral to four-coordinate square-planar, diamine comlexes invariably preseve their distorted octahedral structure with the introduction of up to two