Acetals: a new organocatalysis chemotype for one-pot enantioselective α-amination
摘要:
Conditions are described for one-pot Bronsted acid and organocatalysed enantioselective alpha-amination of acetals and associated functionalities. Of the organocatalysts screened, proline tetrazole gave the highest ee, while aqueous monochloroacetic acid proved to be the best Bronsted acid activator regarding minimizing racemization and maximizing product yield. The reaction opens up the way for using masked carbonyl functionalities in organocatalysis. (C) 2014 Elsevier Ltd. All rights reserved.