Single electron transfer approaches to the practical synthesis of aromatic and heterocyclic-CF2H derivatives
作者:William R Dolbier、Maurice Médebielle、Samia Ait-Mohand
DOI:10.1016/s0040-4039(01)00873-5
日期:2001.7
Single electron transfer (SET) approaches with organic reductants such as sodium hydroxymethanesulfinate (Rongalite®), sodiumdithionite (regarded as precursors of sulfoxylate radical anion) and tetrakis(dimethylamino)ethylene (TDAE) were employed for the reductive dehalogenation of a series of halogeno-difluoromethylated aromatics and heterocycles, and for the practical synthesis of the corresponding
Difluoromethylation Reactions of Ethyl Pyruvate with the TDAE - A MildApproach to the Synthesis of 3,3-Difluoro-2-hydroxy-2-methyl-4-oxo-butyric Ethyl Esters Derivatives
作者:Maurice Médebielle、Katsuya Kato、William R. Dolbier Jr.
DOI:10.1055/s-2002-33517
日期:——
New 3,3-difluoro-2-hydroxy-2-methyl-4-oxo-butyric ethyl esters derivatives are easily obtained in moderate to good yields from the tetrakis(dimethylamino)ethylene (TDAE) mediated reduction of a series of RCF2X (X = Cl or Br) starting materials in the presence of ethyl pyruvate.
Tetrakis(dimethylamino)ethylene (TDAE) as a useful reductant of some chlorodifluoromethylated ketones. A new approach for the synthesis of α,α-difluoroketone derivatives
作者:Conrad Burkholder、William R. Dolbier、Maurice Me´debielle、Alexandre Ndedi
DOI:10.1016/s0040-4039(98)02028-0
日期:1998.11
Tetrakis(dimethylamino)ethylene (TDAE) was found to be an effective reductant of chlorodifluoromethylated ketones1–3. The generated α,α-difluoroacetyl anion was trapped with several aldehydes4–7, under mild conditions, to give the corresponding 2,2-difluoro-3-hydroxy ketone derivatives8–13, in moderate yields.
Electrochemical addition of chlorodifluoroacetyl aromatic compounds to electron-rich olefinic substrates. A convenient synthesis of gem-difluoro heterocyclic compounds
作者:Maurice Médebielle
DOI:10.1016/0040-4039(95)00222-x
日期:1995.3
N,N-dimethyl-4-(chlorodifluoroacetyl)-1-napthylamine and of N,N-dimethyl-2,4-bis(chlorodifluoroacetyl)-1-napthylamine in the presence of electronrich olefinic substrates yields gem-difluoro heterocycliccompounds after intramolecular cyclization of a γ,γ-difluoroalkyl radical.