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.
1,1,1,3,3,3-Hexafluoro-2-Propanol-Promoted Friedel–Crafts Reaction: Metal-Free Synthesis of C3-Difluoromethyl Carbinol-Containing Imidazo[1,2-a]pyridines at Room Temperature
作者:Juanjuan Gao、Zhaowen Liu、Xiaohua Guo、Longhui Wu、Zhixi Chen、Kai Yang
DOI:10.3390/molecules28227522
日期:——
and efficient method has been developed for the synthesis of C3-difluoromethyl carbinol-containing imidazo[1,2-a]pyridines at room temperature via the HFIP-promoted Friedel-Crafts reaction of difluoroacetaldehyde ethyl hemiacetal and imidazo[1,2-a]pyridines. This strategy could be applied to the direct C(sp2)-H hydroxydifluoromethylation of imidazo[1,2-a]pyridines and afford a series of novel difluoromethylated