Imide-amide rearrangement of cyclic phosphorimidates: A mechanistic study

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Abstract

Studies aimed at the development of new synthetic pathways for the preparation of chiral cyclic oxaza and diaza phosphoramides suitable for use in asymmetric chemistry led us to the investigation of the imide-amide rearrangement of cyclic phosphorimidates. As a result of this work new types of oligomeric organophosphorus compounds, formed by a novel 1,4-addition type ring opening polymerisation, were identified. These compounds are the stable intermediates of the imide-amide rearrangement, which upon heating yield the previously reported rearranged product. A detailed study of the mechanism of the Lewis acid catalysed imide-amide rearrangement and stereochemical control of the final products is reported. As a result, the full mechanism was elucidated and evidence of retention of configuration at the rearranged carbon atom is presented. Substituent effects were rationalised based on molecular modelling calculations.

Original languageEnglish
Pages (from-to)1455-1467
Number of pages13
JournalChemistry - A European Journal
Volume7
Issue number7
DOIs
Publication statusPublished - 1 Apr 2001

Keywords

  • Heterocycles
  • Imide-amide rearrangement
  • Mechanism elucidation
  • Molecular modeling
  • Polymers

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