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.
-4H-thiopyran. Its lithium salt exhibited also interesting properties: Peterson olefination products were formed under reaction with aldehyde, and a stable thiabenzene was effectively obtained with n-hexylbromide. The role of the silyl substituents was decisive to explain the particular aspects of the reactivity of these silyl substituted thiopyrans. GRAPHICAL ABSTRACT
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
activation, the vinyl fluorine of perfluoroketene dithioacetal may be substituted by silylated nucleophiles. Using silyl alkynes, a formal transition metal free sila-Sonogashira cross-coupling reaction occurred. The resulting enynes were hydrolyzed giving new polyfunctional trifluoromethyl building blocks.
FLUORINATED PYRIDAZIN-3-ONES FOR THE USE THEREOF IN THE TREATMENT OF LUNG DISEASES
申请人:UNIVERSITE DE REIMS CHAMPAGNE-ARDENNE
公开号:US20170247335A1
公开(公告)日:2017-08-31
The present invention concerns compounds belonging to the family of fluorinated pyridazin-3-ones, for the use thereof in the treatment of broncho-pulmonary conditions. In compounds having a formula, or a pharmaceutically acceptable salt of the compound, the formula includes R1 representing H, an alkyl, an aryl or a heteroaryl; either E2 and E3 representing, separately from each other, H, an alkyl, an aryl or a heteroaryl, or R2 and R3 being bridged within a same cycle or via several cycles; and F representing CF
3
, (CF
2
)nCF
3
or CF
2
H, with n representing an integer of between 1 and 7.