Fluorinated ketene dithioacetals. 2. Synthesis of 2-hydroperfluoro acid derivatives from perfluoroketene dithioacetals
摘要:
Perfluoroketene dithioacetals were prepared in high yields from perfluoroaldehyde hydrates via their thioacetalization (TiCl4/CH2Cl2) followed by basic phase transfer catalyzed HF elimination. Acidic hydrolysis (CF3CO2H, H2O) and then transesterification (EtOH, Ti(OiPr)4) yielded S-alkyl 2-hydroperfluoro thioesters and ethyl 2-hydroperfluoro esters, respectively.
Nucleophilic chain substitution on perfluoroketene dithioacetals by ethyl 2-trimethysilyl acetate. Application to the synthesis of 2-trifluoromethyl succinic acid derivatives
A highly efficient substitution of the vinyl fluoride of perfluoroketene dithioacetals was achieved using trimethylsilylacetate to give 2-perfluoroalkyl succinicacid derivatives and 2-trifluoromethyl succinimides. This chain process was initiated by a catalytic amount of fluoride salt, whereas reaction failed with the corresponding lithium enolate.
Diels–Alder reactions of perfluoroketene dithioacetals with electron-rich 1,3-dienes: a new access to polysubstituted aromatic sulfides
作者:Jean-Philippe Bouillon、Sergiy Mykhaylychenko、Sigismund Melissen、Agathe Martinez、Dominique Harakat、Yuriy G. Shermolovich
DOI:10.1016/j.tet.2012.07.054
日期:2012.10
The present paper describes the Diels–Alder reactions of perfluoroketene dithioacetals with electron-rich 1,3-dienes (2,3-dimethylbuta-1,3-diene, isoprene, penta-1,3-diene) followed by spontaneous HF and thiol elimination, leading to polysubstituted aromatic sulfides in moderate to good yields. Reactions seem to be dependent on the substitution patterns of perfluoroketene dithioacetals; the best results
Synthesis of New 3-(1-Ethylsulfanyl-2-perfluoroalkyl)-5-hydroxy-5-methyl (or 5-phenyl)-1,5-dihydro-pyrrol-2-ones Starting from γ-Keto Thioesters and Amines
γ-Keto thioesters were easily transformed into α,β-unsaturated lactams using a two-step process (via furans) or by a one-pot reaction. This methodology is general and efficient leading to a varied substitution pattern. The structures of all new heterocycles were assigned using 2D NMR experiments, computer-assisted elucidation, and X-ray diffraction analyses.
New route to the 5-((arylthio- and heteroarylthio)methylene)-3-(2,2,2-trifluoroethyl)-furan-2(5H)-ones—Key intermediates in the synthesis of 4-aminoquinoline γ-lactams as potent antimalarial compounds
作者:Oleksandr S. Kanishchev、Adeline Lavoignat、Stéphane Picot、Maurice Médebielle、Jean-Philippe Bouillon
DOI:10.1016/j.bmcl.2013.08.108
日期:2013.11
In this Letter we report on a multi-step synthesis of 5-((arylthio- and heteroarylthio)-methylene)-3-(2,2,2-trifluoroethyl)furan-2(5H)-ones starting from γ-keto thiolester or γ-keto carboxylic acid. The keyintermediate γ-lactones were then reacted with 4-aminoquinoline-derived amines via ring opening—ring closure (RORC) process affording the corresponding γ-hydroxy-γ-lactams in moderate to good yields
Straightforward synthesis of tri- and tetra-substituted 3-trifluoromethylfurans by heterocyclization reaction of perfluoroketene dithioacetals
作者:Clément De Saint Jores、Ivan Mukan、Tatyana Yegorova、Dominique Harakat、Jean-Philippe Bouillon
DOI:10.1016/j.tet.2016.09.009
日期:2016.10
Various 2-ethylsulfanyl-3-trifluoromethylfurans were obtained, in moderate to good yields, using a two-step procedure, from perfluoroketene dithioacetals as starting materials. Reaction tolerated a large variety of substituents on the furan nucleus. Mechanism of cyclization was also proposed based on the electronic properties of aryl and heteroaryl substituents.