Synthesis of Tetraalkyl (Pyrrolidine-2,2-diyl)bisphosphonates and 2,2-Bis(diethoxyphosphoryl)-3,4-dihydro-2H- pyrrole 1-Oxide; ESR Study of Derived Nitroxides
Synthesis of N-(phosphonomethyl)glycine derivatives and studies of their immunotropic activity
作者:M. V. Shevchuk、L. A. Metelitsa、L. L. Charochkina、S. E. Mogilevich、E. B. Rusanov、A. E. Sorochinsky、V. P. Khilya、V. D. Romanenko、V. P. Kukhar
DOI:10.1007/s11172-011-0111-1
日期:2011.4
The Petasis reaction between glyoxylic acid, α-amino phosphonates, and organylboronic acid afforded N-phosphonomethyl-α-amino acids. This method has an advantage of preparative simplicity and high diastereoselectivity of the reactions. Immunotropic activity of the synthesized compounds was studied using the models in vivo.
Optimization, Continuation and Lack of the One-Step Diphosphorylation Reaction. Assay of Modification of the Tetraethyl(pyrrolidine-2,2-diyl)bisphosphonate
作者:Gilles Olive、Alain Jacques
DOI:10.1080/10426500307821
日期:2003.1.1
The optimization of the one-step diphosphorylation reaction is reported The synthesis of new alpha-aminobisphosphonates with four- and six-membered rings and acyclic species with several substituents on the nitrogen atom and on the carbon atom bearing the two phosphorus atoms is described.
Combined Ring Inversion and Side Group Rotation in Geminal Diphosphoryl Substituted Pyrrolidinoxyl Radicals: ESR Analysis of Chemical Exchange between Four Nonequivalent Sites
作者:Antal Rockenbauer、Anne Mercier、François Le Moigne、Gilles Olive、Paul Tordo
DOI:10.1021/jp970298o
日期:1997.10.1
The ESR spectra of three diphosphorylated pyrrolidinoxyl radicals have been studied over a large temperature range. While for the trans 2,5-disubstituted compound 1 no line width alternation was found, for the 2,2-disubstituted compounds 2 and 3, dramatic changes in the spectra were observed as a function of the temperature. These changes were explained by a four-site chemical exchange model including both ring inversion and hindered rotation around the carbon-phosphorus bonds. For radical 3, the presence of additional 5,5-dimethyl substitution can completely block rotations around carbon-phosphorus bonds for certain ring geometries, while for other ring conformations chemical exchange still occurs through combined inversion-rotation processes. An effective two-site model composed of nonequivalent sites and a superposition model composed of a pair of exchanging conformers and a pair of nonexchanging conformers were used to simulate spectrum variations. A satisfactory fit was obtained over the entire temperature range investigated. From the temperature dependence of the exchange frequencies the potential barriers for ring inversion (27 kJ/mol), for combined inversion-rotation (11 kJ/mol), and for rotation around the carbon-phosphorus bonds (14 kJ/mol) were estimated.
UTILISATION D'AMINOPHOSPHONATES COMME MARQUEURS DE PH EN RMN DU 31 P
申请人:CENTRE NATIONAL DELA RECHERCHE SCIENTIFIQUE (CNRS)