Stereoselective reduction of imines with trichlorosilane using solid-supported chiral picolinamides

SD Fernandes, R Porta, PC Barrulas, A Puglisi… - Molecules, 2016 - mdpi.com
SD Fernandes, R Porta, PC Barrulas, A Puglisi, AJ Burke, M Benaglia
Molecules, 2016mdpi.com
The stereoselective reduction of imines with trichlorosilane catalyzed by chiral Lewis bases
is a well-established procedure for the synthesis of enantio-enriched amines. Five supported
cinchona-based picolinamides have been prepared and their activity tested in a model
reaction. The comparison of different supporting materials revealed that polystyrene gave
better results than silica in terms of stereoselectivity. The applicability of the solid-supported
catalyst of choice to the reduction of different imines was also demonstrated. Additionally, for …
The stereoselective reduction of imines with trichlorosilane catalyzed by chiral Lewis bases is a well-established procedure for the synthesis of enantio-enriched amines. Five supported cinchona-based picolinamides have been prepared and their activity tested in a model reaction. The comparison of different supporting materials revealed that polystyrene gave better results than silica in terms of stereoselectivity. The applicability of the solid-supported catalyst of choice to the reduction of different imines was also demonstrated. Additionally, for the first time, a catalytic reactor containing a polymer-immobilized chiral picolinamide has been employed for the stereoselective reduction of imines with trichlorosilane under continuous flow conditions.
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