Synthesis of the First Stable Phosphonamide Transition State Analogue
作者:P. de Medina、L. S. Ingrassia、M. E. Mulliez
DOI:10.1021/jo034229j
日期:2003.10.1
Three methods were selected for the one-pot synthesis of the fully protected beta-fluoroaminophosphonic acids, using the readily accessible N-protected beta-fluoroaminals. These were activated by acylation leading, by beta-elimination, to a transient N-acylimine immediately trapped by reactive forms of dialkyl phosphites. Avoiding basic conditions, the complete or partial deprotection of these N-protected
Synthese Simple des Analogues Fluores, Phosphones ou Sulfones de L'Acide Aspartique
作者:Laurent Bijeire、Colette Denier、Michel Mulliez、Waldir Tavares De Lima
DOI:10.1080/10426500601087418
日期:2007.2.15
Two stable hemiaminals, N acylated by the p-nitrobenzoyl or Boc group and each substituted by the difluorocarboxylethylester moiety, were obtained in a single step from the corresponding ethylhemiacetal. The Boc compound, after acylation by trifluoroacetic anhydride followed by in situ reaction either with trimethylsilylated derivatives of cyanide or diethylphosphite, or with sodium sulfite, led to
1-Trifluoromethyl-1-diethoxyphosphoryl Carbene: A New Synthon for the Preparation of CF<sub>3</sub>-Containing α-Hydroxy and α-Amino Phosphonic Acid Derivatives
starting from readily available compounds. The synthetic utility of this compound is demonstrated via its Rh-catalyzed insertion into O-H and N-H bonds to produce CF 3 -substituted α-hydroxy phosphonic and α-amino phosphonic acid derivatives.
A Pd-catalyzed method based on the use of a molecular tether is described for olefin difunctionalization. Enabled by an easily introduced trifluoroacetaldehyde-derived tether, a simultaneous introduction of oxygen and nitrogen heteroatoms across unsaturated carbon–carbon bonds was achieved under oxidative conditions, most probably via high-valent Pd intermediates. Good yields and high diastereoselectivity