considerable attention. Outlined herein is the synthesis of two new ligands based on the C2-symmetric 11,12-diamino-9,10-dihydro-9,10-ethanoanthracene. The scope of the new ligands has been evaluated in the catalytic asymmetric addition of diethylzinc to a variety of ketones. Enantioselectivities as high as 99% have been achieved. The structures of two of these ligands have been determined by X-ray crystallography
烷基向酮的催化不对称加成反应已引起相当大的关注。本文概述了基于C 2对称的11,12-二
氨基-9,10-二氢-9,10-乙基
蒽的两个新
配体的合成。在将
二乙基锌催化不对称加成到各种酮中时,已经评估了新
配体的范围。对映选择性高达99%。这些
配体中的两个的结构已经通过X射线晶体学确定并且与相关结构进行了比较。另外,还报道了与双(磺酰胺)二醇
配体结合的
钛配合物的结构。