作者:Oliver Huttenloch、Jan Spieler、Herbert Waldmann
DOI:10.1002/1521-3765(20010202)7:3<671::aid-chem671>3.0.co;2-m
日期:2001.2.2
The development of new ligands for catalytic asymmetric C-C bond formation is of great interest to organic synthesis. We describe here a new class of chiral phosphoramidites that embody one or two binaphthol units attached to an achiral azabicyclic [3.3.1] or [3.3.0] framework. These ligands were easily accessible from (R)1,1'-binaphthyl-2,2'-dioxaphosphorchloridite (4) and the corresponding heterobicyclic
用于催化不对称CC键形成的新配体的开发对有机合成非常感兴趣。我们在这里描述了一类新的手性亚磷酰胺,其包含一个或两个与非手性氮杂双环[3.3.1]或[3.3.0]骨架连接的联萘酚单元。这些配体很容易从(R)1,1'-联萘-2,2'-二氧杂磷酰氯(4)和相应的杂环双环核心1、2或3中获得。它们用于对映选择性的Cu催化的不同二烷基锌试剂的加成反应中环状和非环状烯酮。以高达91:9的对映体比例获得手性酮。事实证明,最佳配体的选择强烈依赖于每种底物。此外,发现配体6最适合α-β-不饱和酯的Rh催化氢化,