ChemInform Abstract: UMSETZUNG VON VINYLOGEN FORMAMIDINIUMSALZEN MIT NUCLEOPHILEN 2. MITT. POLYMETHINIUMSALZE AUS METHYLENAKTIVEN KETONEN

Abstract

Die Kondensation des Acetals (I) mit den Ketonen (II) liefert die Dimethylaminopentadienone (III).

Cyclotrimerization of Enaminones: An Efficient Method for the Synthesis of 1,3,5-Triaroylbenzenes

“…1 Indeed, the level of architectural sophistication that can be achieved in such systems is closely tied to the availability of suitable starting materials. 2,3 1,3,5-Triaroylbenzenes have been synthesized in low to moderate yield by limited routes which include oxidation of the corresponding secondary alcohol by CrO 3 4 or ethynylarylcarbinol by active MnO 2 , 5 oxidative condensation of 1,3,5-triacylbenzene derivatives with bis-diquaternary ammonium salt of the conjugated dienes, 6 reaction of methyl benzoate with alkynes in the presence of quaternary ammonium salt, 7 acidic cyclotrimerization of ethylene epoxide derivatives 8 and aroylvinyl sulfonium salts. 9 Palladium-induced cyclotrimerization of b-aminoketones has also been reported to afford triaroylbenzenes but in low yield.…”