first time. The reaction is stereospecific and provides fair to quantitative yields of fluoroalkenes. The Mizoroki–Heck reaction starting from more hindered and usually reluctant trisubstituted acrylate, to access tetrasubstituted fluoroalkenes, is also reported. Finally, the use of a three-step synthesis sequence, including Mizoroki–Heck reaction, allows the synthesis of fluorinated analogues of therapeutic
In this manuscript, a simple and efficient sulfa-Michael addition reaction of aryl thiols to trisubstituted α-fluoro-α,β-unsaturated esters both in racemic and, for the first time, in enantioselective version is reported. The commercially available dimer of cinchona derivatives (DHQ)2PYR was used as a catalyst. This strategy showed a great tolerance for various substrates and substituents, providing
Zinc(0)–Copper(I) Chloride Promoted Reaction of Methyl Dichlorofluoroacetate with Carbonyl Compounds. A New Efficient Method for the Synthesis of Methyl (<i>Z</i>)-α-Fluoro-α,β-unsaturated Carboxylates
作者:Takashi Ishihara、Manabu Kuroboshi
DOI:10.1246/cl.1987.1145
日期:1987.6.5
dichlorofluoroacetate, easily prepared from methyl trichloroacetate and antimony(III) fluoride, underwent the reductive coupling–elimination reaction with carbonyl compounds in the presence of zinc(0), a catalytic amount of copper(I) chloride, aceticanhydride, and molecular sieves to give the corresponding (Z)-α-fluoro-α,β-unsaturated carboxylic acid methyl esters in high yields.
Some synthetic applications of the reactivity of methyl 2-fluoro-3-(phenylthio)acrylate
作者:Didier F. Andrès、Eliane G. Laurent、Bernard S. Marquet
DOI:10.1016/s0022-1139(98)00249-8
日期:1998.10
The synthetic usefulness of the title compound is demonstrated through its reactivity towards thio and amino nucleophiles as well as tin-centred radicals. The synthesis of a 2-fluoro analogue of a natural fungicide (Sinharine) is reported. We also show that 3-aryl-2-fluoropropenoates could be obtained via Stille coupling between an aryl iodide and a 3-tributylstannyl-2-fluoropropenoate. (C) 1998 Elsevier Science S.A. All rights reserved.
ISHIHARA TAKASHI; KUROBOSHI MANABU, CHEM. LETT.,(1987) N 6, 1145-1148