A perfect double role of CF3 groups in activating substrates and stabilizing adducts: the chiral Brønsted acid-catalyzed direct arylation of trifluoromethyl ketones
作者:Jing Nie、Guang-Wu Zhang、Lian Wang、Aiping Fu、Yan Zheng、Jun-An Ma
DOI:10.1039/b900474b
日期:——
A direct and efficient Brønsted acid-promoted arylation of tri- and difluoromethyl ketones, as well perfluoroalkyl ketones, has been developed; good to excellent enantioselectivities (up to 99% ee) were achieved.
Direct aldol condensation reaction of ethyl diazoacetate with trifluoromethyl ketones
作者:Han-Feng Cui、Lian Wang、Li-Jun Yang、Jing Nie、Yan Zheng、Jun-An Ma
DOI:10.1016/j.tet.2011.09.009
日期:2011.11
An efficient and directaldol-type condensation of ethyl diazoacetate with trifluoromethyl ketones was developed in the presence of dialkyl zinc. A series of trifluoromethylated products were obtained in good to excellent yields (60–95%). A preliminary extension to a catalytic enantioselective aldol reaction of ethyl diazoacetate to trifluoromethyl ketones (up to 72% ee) is also described.