Enantioselective <i>O</i>- and <i>N</i>-Nitroso Aldol Synthesis of Tin Enolates. Isolation of Three BINAP−Silver Complexes and Their Role in Regio- and Enantioselectivity
作者:Norie Momiyama、Hisashi Yamamoto
DOI:10.1021/ja039103i
日期:2004.5.1
ratio and/or choice of silver salt. Indeed, the X-ray crystallographic study has been used to gain insight into the structure of the catalyst. After the evaluation of each species, 1:1 (AgX.(R)-BINAP) complex was found to be the real active species in the O-selective nitroso aldol reaction. On the other hand, a systematic survey of solvent has shown that the optimal 2:1 (AgX.(R)-BINAP) complex is the effective
通过金属/配体比例的适当组合和/或银盐的选择,实现了三种不同银-BINAP 催化剂的选择性生成。事实上,X 射线晶体学研究已被用于深入了解催化剂的结构。在对每种物质进行评估后,发现 1:1 (AgX.(R)-BINAP) 复合物是 O-选择性亚硝基醛醇反应中真正的活性物质。另一方面,对溶剂的系统调查表明,最佳的 2:1 (AgX.(R)-BINAP) 配合物是 N-选择性途径中的有效催化剂。因此,银-BINAP 催化剂的新生成方法和合成转化不仅为催化对映选择性亚硝基羟醛合成的发展领域提供了新的见解,而且为有效催化剂的设计提供了明确的指导。