The easy radical trifluoromethylation of a series of 1,3-dicarbonyl compounds with CF3I is described. The reaction occurs in the presence of a nitrogen base and sodium dithionite in CH3CN-H2O solution. Additionally, we report a new access to ammonium triflinates. (c) 2007 Elsevier Ltd. All rights reserved.
Substrate Range of the Titanium TADDOLate Catalyzed Asymmetric Fluorination of Activated Carbonyl Compounds
作者:Andreas Bertogg、Lukas Hintermann、Dominique P. Huber、Mauro Perseghini、Maria Sanna、Antonio Togni
DOI:10.1002/hlca.201100375
日期:2012.3
4‐diazoniabicyclo[2.2.2]octane bis‐[tetrafluoroborate]) at room temperature. A series of α‐methylated β‐keto esters (3‐oxobutanoates, 3‐oxopentanoates) with bulky benzyl ester groups (60–90% ee) or phenyl ester (67–88% ee) have been fluorinated readily, whereas α‐acyl lactones were also readily fluorinated, but gave lower inductions (13–46% ee). Double stereochemical differentiation in β‐keto esters with chiral
The easy radical trifluoromethylation of a series of 1,3-dicarbonyl compounds with CF3I is described. The reaction occurs in the presence of a nitrogen base and sodium dithionite in CH3CN-H2O solution. Additionally, we report a new access to ammonium triflinates. (c) 2007 Elsevier Ltd. All rights reserved.