Chiral Zirconium Complex as Brønsted Base Catalyst in Asymmetric Direct-type Mannich Reactions
作者:Shū Kobayashi、Matthew M. Salter、Yumi Yamazaki、Yasuhiro Yamashita
DOI:10.1002/asia.200900524
日期:2010.3.1
Activating carbonyls: Asymmetric direct‐type Mannich reaction using a chiral zirconium complex as Brønsted base is demonstrated. Zirconium complexes prepared from Zr(OtBu) and 3,3′‐disubstituted BINOL are found to be good catalysts in the reactions of an iminoester with malonates, and high enantioselectivities are obtained.
活化羰基:证明了使用手性锆配合物作为布朗斯台德碱的不对称直接型曼尼希反应。在亚氨基酯与丙二酸酯的反应中,发现由Zr(O t Bu)和3,3'-双取代的BINOL制备的锆络合物是良好的催化剂,并获得了高对映选择性。