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
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.
Synthesis of α-trifluoromethyl-α-hydroxycarboxylate dervatives and their phosphorus-containing analogs with the use of fluorinated diazo compounds
作者:I. D. Titanyuk、D. V. Vorob’eva、S. N. Osipov、I. P. Beletskaya
DOI:10.1134/s1070428010050015
日期:2010.5
Approach was developed underlain by the use of fluorinated diazocompounds to the synthesis of derivatives of alpha-trifluoromethyl-alpha-hydroxycarboxylic acids and their phosphorus-containing analogs, alpha-trifluoromethyl-alpha-hydroxyphosphonic acids. Methyl 2-diazo-3,3,3-trifluoropropionate and diethyl 1-diazo-2,2,2-trifluoroethylphosphonate under the action of catalytic quantities of dirhodium tetraacetate Rh-2(OAc)(4) easily inserted into the O-H bond leading to the formation of the corresponding products in high yields.
A new preparative method for the synthesis of diethyl 1-diazo-2,2,2-trifluoroethylphosphonate via an imino phosphonate
作者:N. M. Karimova、D. V. Vorobyeva、G. T. Shchetnikov、S. N. Osipov
DOI:10.1007/s11172-010-0051-1
日期:2010.1
A preparativemethod for the synthesis of diethyl 1-diazo-2,2,2-trifluoroethylphosphonate from trifluoroacetic anhydride and benzyl carbamate via diethyl 1-benzyloxycarbonylimino-2,2,2-trifluoroethylphosphonate is developed. Optimum conditions for the chlorination of benzyl N-trifluoroacetylcarbamate with SOCl2—Py to afford the imidoyl chloride, phosphorylation of the latter under the conditions of