The selective and direct introduction of the fluorine atom into the α-position of β-dicarbonylcompounds was electrochemically achieved using iodotoluene difluoride as the mediator. The resulting α-fluoro-β-dicarbonyl compounds are important building blocks for biologically active compounds.
Decarboxylative arylation with diaryliodonium(<scp>iii</scp>) salts: alternative approach for catalyst-free difluoroenolate coupling to aryldifluoromethyl ketones
α-Aryl-α,α-difluoroketones were synthesized via decarboxylative arylation using diaryliodonium salts under catalyst-free conditions without organometallic intermediates. The products can be transformed into various difluorinated functional groups.
The highly enantioselective synthesis of 2,2-difluoro-3 -hydroxycarboxylates has been achieved by hydrogenating 2,2-difluoro-3-oxocarboxylates in the presence of chiral rhodium-(amidephosphine-phosphinite) complexes. Ethyl 4,4,4-triffluoroacetoacetate can be successfully transformed into the enantiomerically enriched 4,4,4-trifluoro-3-hydroxybutanoate in the same manner. (C) 2000 Elsevier Science Ltd. All rights reserved.
LINDERMAN, RUSSELL J.;GRAVES, DAVID M., J. ORG. CHEM., 54,(1989) N, C. 661-668