An ionic liquid as reaction medium for the synthesis of halo-containing β-enaminones at room temperature
作者:Marcos A. P. Martins、Emerson A. Guarda、Clarissa P. Frizzo、Mara R. B. Marzari、Dayse N. Moreira、Nilo Zanatta、Helio G. Bonacorso
DOI:10.1007/s00706-008-0923-3
日期:2008.11
, Et , Bu , allyl, tert -amyl, CH2CH2OH, Bn , Ph ] were synthesized using the ionic liquid [bmim]BF4 at roomtemperature. It is demonstrated that this ionic liquid is a reaction medium suitable for the amination of β-alkoxyvinyl halomethyl ketones. The advantages of this method are the absence of solvents, short reaction times, and good yields.
一系列二十个卤代甲基化的β-烯酮[ R C(O)CH = C( R 1)N R 3 R 4,其中 R = CF 3,CCl 3,CHCl 2; R 1= H, Me , Ph ; R 3 = H, Me , Bu , Et ; R 4 = Me , Et , Bu ,烯丙基, 叔 戊基,CH 2在室温下使用离子液体[bmim] BF 4合成CH 2 OH, Bn 和 Ph ] 。已经证明该离子液体是适合于β-烷氧基乙烯基卤代甲基酮的胺化的反应介质。该方法的优点是无溶剂,反应时间短,产率高。
Zn(ClO<sub>4</sub>)<sub>2</sub>·6H<sub>2</sub>O as a Powerful Catalyst for the Conversion of β-Ketoesters into β-Enamino Esters
Zn(ClO 4 ) 2 .6H 2 O proved to be a very powerfulcatalyst for the condensation of primary and secondary amines with β-ketoesters to give N-substituted β-enaminoesters.
Reactions of regioisomeric fluoroalkyl-containing ?-aminovinyl ketones with hydrazines
作者:K. I. Pashkevich、V. I. Filyakova、O. A. Kuznetsova
DOI:10.1007/bf01430665
日期:1996.12
Fluoroalkyl β-alkyl-β-aminovinyl ketones react with hydrazine hydrate to give the respective razoles and with phenylhydrazine they form a mixture of pyrazoles and 5 hydroxy-δ2-pyrazolines. Alkyl(aryl) β-fluoroalkyl-β-aminovinylketones do not react with the hydrazines mentioned above. With 2,4-dinitrophenylhydrazine, both types of fluoroalkyl-containing β-aminovinyl ketones give only hydrazones of the
among a range of catalytically relevant enamines. Spin population analysis disclosed that enamine radical cations mainly exhibit the carbon-center free radical feature. Taking experimental and computation data together, a comprehensive picture about the redox property of enamines is presented, which would provide guidance in the development of oxidative enamine catalysis and transformations.
Annulation of functionalized hexadienones as an efficient regioselective approach to N-aryl-2-trifluoromethyl)-4-pyridinamines
作者:Maria T. Cocco、Cenzo Congiu、Valentina Onnis
DOI:10.1016/s0040-4039(99)00758-3
日期:1999.6
Readily accessible fluorinated N-arylenaminones 3 were reacted with N,N-dimethylformamide dimethylacetal to produce functionalized hexadienones 4. Ringclosure of 4 with ammonium acetate afforded selectively N-aryl-2-(trifluoromethyl)-4-pyridinamines 5 in good to excellent yields.