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.
The present invention relates to compounds of formula (I):
wherein R
1
to R
3
, A, M, L, E, G, and J are as defined in the description and claims. The invention also relates to a process for the manufacture of such compounds, pharmaceutical compositions containing them, and methods for treating CNS disorders.