was synthesized from available precursors and applied as an efficient organocatalyst for asymmetric Michael additions of β-dicarbonyl compounds to α-nitroolefins in the presence of water. Corresponding Michael adducts were generated under proposed conditions in nearly quantitative yield with high enantioselectivity (up to 99% ee). Useful precursors to pharmaceutically important chiral β-amino acids and
由可用的前体合成手性叔胺衍生的离子型液体支撑的方胺,并将其用作有效的有机催化剂,在
水存在下将β-二羰基化合物不对称迈克尔加成到α-硝基烯烃上。相应的迈克尔加合物在拟议的条件下以接近定量的产率和高对映选择性(高达99%ee)生成。药学上重要的手性β-
氨基酸和抗惊厥药
普瑞巴林的有用前体可以使用开发的“
水上”方案方便地制备。该催化剂易于回收和重复使用30次以上,而催化反应活性和选择性没有明显降低。