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.
An enantioselective hydroxyalkylation of indoles and 7‐azaindole with trifluoromethyl ketones was found to be effectively promoted under high‐pressure conditions with a low loading of Cinchona alkaloids (e.g., 1–3 mol% of cinchonidine). Chiral tertiary alcohols containing a trifluoromethyl group were obtained at 9 kbar with good yield and enantioselectivity up to 89%, whereas usually merely traces