β-Isocupreidine-Catalyzed Baylis−Hillman Reaction of Chiral <i>N</i>-Boc-α-Amino Aldehydes
作者:Ayako Nakano、Keisuke Takahashi、Jun Ishihara、Susumi Hatakeyama
DOI:10.1021/ol0622561
日期:2006.11.9
relationship between the substrate and the catalyst. In the case of acyclic amino aldehydes, L-substrates show excellent syn selectivity and high reactivity in contrast to D-substrates. On the other hand, in the case of cyclic amino aldehydes, D-substrates rather than L-substrates show excellent anti selectivity and high reactivity.
[结构:见正文]发生了β-异cupreidine(β-ICD)催化的手性N-Boc-α-氨基醛与1,1,1,3,3,3-六氟异丙基丙烯酸酯(HFIPA)的Baylis-Hillman反应没有消旋作用,并且在底物和催化剂之间表现出匹配-不匹配的关系。在无环氨基醛的情况下,与D-底物相比,L-底物显示出优异的顺式选择性和高反应性。另一方面,在环状氨基醛的情况下,D-底物而不是L-底物显示出优异的抗选择性和高反应性。