Conjugated azoalkenes. Part VI. α-Olefinated carbonyl derivatives by treatment of azoalkenes with carbomethoxymethylene triphenylphosphorane
作者:Orazio A. Attanasi、Paolino Filippone、Stefania Santeusanio
DOI:10.1016/s0040-4039(00)82192-9
日期:1988.1
α-Olefinated carbonyl derivatives have been obtained in good yield under very mild conditions by Wittig-type reaction of some conjugated azoalkenes with carbomethoxymethylene triphenylphosphorane. The reaction mechanism seems to implicate zwitterionic rather than cycloadduct intermediate, as usual for the Wittig reaction.
Conjugated azoalkenes. Part IX. New 1-amino-4-triphenylphosphoranylidene-5-oxo-2-pyrrolines or αβ-unsaturated hydrazones by reaction of azoalkenes with carboalkoxymethylene triphenylphosphorane
作者:Orazio A. Attanasi、Paolino Filippone、Amedeo Mei、Alessandro Bongini、Elisabetta Foresti
DOI:10.1016/s0040-4020(01)87767-x
日期:1990.1
Wittig-type reaction of some conjugated azoalkenes with carboalkoxymethylene triphenylphosphorane. The isolation and characterization of 1,4-adduct intermediate showed that the reaction mechanism implicates only 1,6-zwitterionic intermediate without cycloadduct production, as usually suggested for the Wittig reaction. The crystalstructure of one of 1-amino-4-tripheny1phosphorany1ide-ne-5-oxo-pyrrolines obtained