Some chiralcatalysts have been tested in the reaction of ethyl 2-bromopropionate with potassium phthalimide and in the borohydride reduction of phenyl t-butyl ketone under phase-transfer conditions. The mechanism of the N-alkylation reaction and the influence of the molecular structure of the catalysts on stereoselectivity are analysed.
Amplification of the chiroptical response of UV-transparent amines and alcohols by <i>N</i>-phthalimide derivatization enabling absolute configuration determination through ECD computational analysis
substrates allowing their reliable absoluteconfiguration determination by computational analysis of ECD spectra. Such a transformation also leads to a significant reduction in the molecular conformational flexibility thus simplifying the conformational analysis required by the computational treatment. The method described herein thus allows the absoluteconfigurationassignment to these challenging substrates
2-Arylazocarboxylate and 2-arylazocarboxamide derivatives can serve as replacements of typical Mitsunobu reagents such as diethylazodicarboxylate. A systematic investigation of the reactivity and physical properties of those azo compounds has revealed that they have an excellent ability as Mitsunobu reagents. These reagents show similar or superior reactivity as compared to the known azo reagents
Polymer-supported alkyl azodicarboxylates for Mitsunobu reactions
作者:Lee D. Arnold、Hanaa I. Assil、John C. Vederas
DOI:10.1021/ja00193a032
日期:1989.5
Preparation de polystyrene portant des groupes azodicarboxylate de methyle par creation de l'hydroxymethyl polystyrene avec le phosgene, puis avec le carbozate de methyle, suivie d'une oxydation. Le polymere obtenu fonctionne comme reactif separable non-explosif avec des rendements de substitution variant entre 41 et 65% et peut etre reutilise apres veoxydation
制备聚苯乙烯基团偶氮二甲酸甲酯,制备 l'羟甲基聚苯乙烯 avec le 光气,puis avec le carbozate demethyle,suvie d'une 氧化。Lepolymere obtenu fonctionne comme reactif separable non-explosif avec des rendements de Replacement variant entre 41 et 65% et peut etre reutilise apres veoxydation
Fischer,E., Chemische Berichte, 1907, vol. 40, p. 491