Aryl halides as convenient precursors of electrogenerated bases. Efficient syntheses of β-oxo nitriles or esters by coupling active-hydrogen groups with esters
In an undivided cell fitted with a sacrifical anode and a nickel cathode on which cadmium had been deposited, the electroreduction of aromatic halides affords a strong base which allows the effective synthesis of β-oxo nitriles or β-oxo esters from the coupling of active-hydrogen compounds with esters.
4-Dimethylamino-1-trifluoracetyl-pyridinium-trifluoracetat: Ein effizientes Reagens zur Synthese von Trifluormethyl-1,3-dicarbonyl-Verbindungen
作者:Gerhard Simchen、Andreas Schmidt
DOI:10.1055/s-1997-1501
日期:1997.1
4-Dimethylamino-1-trifluoroacetylpyridinium Trifluoroacetat: An Efficient Reagent for the Preparation of Trifluoromethyl-1,3-Dicarbonyl CompoundsEnamines 2 and O-trimethylsilyl ketene acetals 4 are trifluoroacetylated on reaction with the title reagent to yield trifluoroacetyl enamines 3 and trifluoromethylsilylenol ethers 5, respectively. Trifluoromethyl 1,3-diketones 6 and trifluoromethyl β-keto esters 7 are obtained by hydrolysis of compounds 3 and 5.