Sequential Stereoselective Catalysis: Two Single-Flask Reactions of a Substrate in the Presence of a Bifunctional Chiral Ligand and Different Transition Metals
作者:Rita Annunziata、Maurizio Benaglia、Mauro Cinquini、Franco Cozzi、Alessandra Puglisi
DOI:10.1002/ejoc.200390201
日期:2003.4
A new bifunctional ligand capable of promoting different stereoselective catalytic transformations in combination with different transition metals has been prepared by connecting with a spacer a bis(oxazoline) to dihydroquinidine; this ligand was employed in a one-flask procedure in which methyl (E)-3-(4-vinylphenyl)propenoate underwent first cyclopropanation at the electron-rich double bond and then
通过将双(恶唑啉)与二氢奎尼丁连接起来,制备了一种新的双功能配体,能够与不同的过渡金属结合促进不同的立体选择性催化转化;该配体用于单烧瓶程序,其中 (E)-3-(4-乙烯基苯基) 丙烯酸甲酯首先在富电子双键上进行环丙烷化,然后在缺电子烯烃上进行二羟基化,得到含有四个具有完全区域控制和高立体选择性的立体中心。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)