A synthetic approach to both enantiomers of the secondary alcohols [Ph(CH2)n CH(OH)CXF2 (n = 0-2) C6H13(CH2)n CH(OH)CFX2 (n = 0 or 2) and CXF2CH(OH)CH2CO2Et [X = H or Cl], involving the stereoselective hydrolysis of ester derivatives, is described. The absolute configurations of these difluoromethylated or chlorodifluoromethylated molecules were determined.
Utilization of perfluoroalkanoate-derived aluminium acetals as the convenient fluorinated aldehyde precursors
Aluminium acetals from the DIBAL partial reduction of perfluoroalkanoates 1 were successfully employed as the convenient and useful fluorinated aldehyde precursors, and reactions of such intermediates with sodium salts from some beta-dicarbonyl compounds 2 as well as their possible utility as the Michael acceptors after transformation to the corresponding alkylidene malonates 8 were also demonstrated. (C) 2011 Elsevier Ltd. All rights reserved.