ONE-STEP, THREE-COMPONENT SYNTHESIS OF DIALKYL 2-(IMIDO-<i>N</i>-YL)-3-(TRIPHENYLPHOSPHORANYLIDENE) BUTANEDIOATES
作者:Ali Ramazani、Homaira Ahani
DOI:10.1080/10426500108040594
日期:2001.3.1
Abstract A one-step synthesis of dialkyl 2-(imido-N-yl)-3-(triphenylphosphoranylidene)butandioates in fairly good yields by the reaction of imides, dialkyl acetylenedicarboxylates and triphenlphosphine is reported. The structures of these compounds were confirmed by IR, MS and 1H, 31P and 13C NMR spectroscopy, and elemental analyses. The NMR spectra indicated that the compounds (CDCl3 as solvent) contained
Phthalimide or succinimide undergo a reaction with dialkyl acetylene-dicarboxylates and triphenylphosphine to produce highly-functionalized stable heterocyclic phosphorus ylides in good yields in water-tetrahydrofuran (6:1). This methodology is of interest because of the use of water as solvent, thus minimizing the cost, operational hazards, and environmental pollution.
MAGNESIUM HYDROGEN SULFATE POWDER CATALYZED STEREOSELECTIVE CONVERSION OF DIALKYL 2-(IMIDO-<i>N</i> -YL)-3-(TRIPHENYLPHOSPHORANYLIDENE)- BUTANEDIOATES TO ELECTRON-POOR (<i>Z</i>)-<i>N</i> -VINYLIMIDES IN SOLVENT-FREE CONDITIONS
作者:Ali Ramazani、Ebrahim Ahmadi
DOI:10.1080/10426500490422218
日期:2004.3.1
Magnesium hydrogen sulfate powder was found to catalyze stereoselective conversion of dialkyl 2-(imido-N-yl)-3-(triphenylphosphoranylidene)butanedioates to electron-poor (Z)-N-vinylimides in solvent-free conditions at 95degreesC 1 h in high conversions. Microwave also was found to catalyze the same reactions in the presence of magnesium hydrogen sulfated powder in solvent-free conditions in 3 min.
Microwave-Induced Stereoselective Conversion of Stabilized Phosphorus Ylides to Electron Poor (<i>Z</i>)-<i>N</i>-Vinylimides in the Presence of Supported Catalysts on Silica Gel in Solvent-Free Conditions
Supported catalyst on silica-gel were found to catalyze stereoselective conversion of dialkyl 2-(imido-N-yl)-3-triphetiylphosphoranylidene butanedioates to electron-poor (Z)-N-vinylimides in solvent-free conditions under microwave irradiation. in 2 to 3 minutes in high conversions. The reaction is completely stereoselective.
Silica Gel Catalyzed Stereoselective Conversion of Dialkyl 2-(Imido- N -YL)-3-(triphenylphosphoranylidene)-butanedioates to Electron-Poor ( Z )- N -Vinylimides in Solvent-Free Conditions
作者:Ali Ramazani、Ebrahim Ahmadi
DOI:10.1080/713744565
日期:2003.10.1
Silica gel was found to catalyze the stereoselective conversion of dialkyl 2-(imido-N-yl)-3-(triphenylphosphoranylidene)butanedioates to electron-poor (Z)-N-vinylimides in solvent-free conditions at 95degreesC in high coversions.