摘要:
The enantioselective organocatalytic direct aldol reactions of ketones with various aldehydes were developed by using chiral 1,2-cyclohexanediamine COACH) based multifunctional ligands via a noncovalent catalysis mechanism. By using a catalyst, we also obtained functionalized 3-alkyl-3-hydroxyindolin-2-ones in high yields and with good to excellent enantioselectivities. (C) 2013 Elsevier Ltd. All rights reserved.