Geminal dialkylation, alkylative reduction and olefination of aliphatic aldehydes. Reaction of gem-bistriflates with higher order dialkylcyanocuprates.
gem-Dialkylation or alkylative reduction of α-unbranched aliphaticaldehydes 1 is advantageously achieved by reaction of the corresponding gem-bistriflates 2 with di-n-alkylcyanocuprates or di-sec- and di-tert-alkylcyanocuprates respectively. The reaction of α-branched gem-bistriflates 2 with dialkylcyanocuprates in the presence of boron trifluoride affords the olefins 6 in good yield.
Reactions of 1-fluoroalkyl triflates with nucleophiles and bases
作者:William R. Dolbier、Masamune Okamoto
DOI:10.1016/j.jfluchem.2015.01.013
日期:2015.11
A series of 1-fluoroalkyl triflates are prepared, isolated and characterized. Their reactions with a large variety of nucleophiles are described. From these reactions are obtained 1-fluoroalkyl nitriles, azides, formates, acetates, ethers, phenylthio ethers, triphenylphosphonium salts, benztriazoles, benzimidazoles, xanthates, iodides, bromides and chlorides, most in excellent yield.
Synthesis of 1,1-Difluoroalkanes via Phase Transfer Catalysed Reaction of 1,1-<i>bis</i>-Triflates with KF in the Presence of Cocatalyst - Ph<sub>3</sub>SnF
作者:Mieczysaw MĽ、Robert Bujok
DOI:10.1055/s-2002-32959
日期:——
1,1-bis-Triflates treated with KF in the presence of triphenyltin fluoride and tetrabutylammonium hydrogen sulfate give 1,1-difluoroalkanes
Preparation of 1,1-difluoroalkanes from aldehydes via 1,1-bistriflates: Advantageous use of HF–Lewis base reagents
作者:William R. Dolbier、Masamune Okamoto
DOI:10.1016/j.jfluchem.2014.06.020
日期:2014.11
Alkane-1,1-bistriflates, prepared in excellent yields by reaction of aldehydes with triflic anhydride, are converted to their respective 1,1-difluoroalkanes in good to excellent yield through reaction with fluorinating agent, triethylaminetrishydrofluoride. Straight chain 1,1-bistriflates are more reactive than those substituted at the 2-position, but the latter are also converted successfully, without evidence of any rearrangement products. (C) 2014 Elsevier B.V. All rights reserved.