Aromatic l-prolinamide-catalyzed asymmetric Michael addition of aldehydes to nitroalkenes
作者:Yongchao Wang、Jun Lin、Kun Wei
DOI:10.1016/j.tetasy.2014.11.006
日期:2014.12
Two chiral aromatic L-prolinamides were synthesized in high overall yield (95%) from N-Boc-L-proline and served as organocatalysts in asymmetric Michael reactions of aldehydes to nitroalkenes. Under the optimized reaction conditions, (S)-N-tritylpyrrolidine-2-carboxamide 4 was found to be a highly efficient organocatalyst for the Michael addition, and the corresponding Michael adducts were obtained in good yields (up to 94%), with excellent enantioselectivities (up to 99% ee) and diastereoselectivities (up to 99:1 dr). (C) 2014 Elsevier Ltd. All rights reserved.