Mechanochemical electrophilic fluorination of liquid beta-ketoesters
作者:Joseph L. Howard、Yerbol Sagatov、Duncan L. Browne
DOI:10.1016/j.tet.2017.11.066
日期:2018.6
An improved substrate scope for the mechanochemical electrophilicfluorination of dicarbonyls is reported. The applicable substrates have now been broadened to include liquid β-ketoesters. Key to this capability is the inclusion of a grinding auxiliary (NaCl) to improve mass transfer and prevent pasting or gumming of the reaction mixture. Notably, the use of a small amount of acetonitrile is critical
Organocatalytic synthesis of quaternary stereocenter bearing a fluorine atom: enantioselective conjugate addition of α-fluoro-β-ketoesters to nitroalkenes
作者:Yeonock Oh、Sun Mi Kim、Dae Young Kim
DOI:10.1016/j.tetlet.2009.06.003
日期:2009.8
The catalytic enantioselective conjugateaddition reaction of α-fluoro-β-ketoesters to nitroalkenespromoted by chiral bifunctional organocatalysts is described. The treatment of α-fluoro-β-ketoesters with nitroalkenes under mild reaction conditions afforded the corresponding Michael adducts containing a fluorinated quaternary stereogenic center with excellent enantioselectivity (up to >99% ee).