Axially chiral tridentate isoquinoline derived ligands for diethylzinc addition to aldehydes
作者:Brian A. Sweetman、Patrick J. Guiry
DOI:10.1016/j.tet.2018.07.048
日期:2018.9
for 1,3-bis-(2-hydroxynaphthalen-1-yl)isoquinoline. 4-tert-Butyl-2-chloro-6-[1-(2-hydroxymethylnaphthalen-1-yl)isoquinolin-3-yl]phenol was resolved by chiral semi-preparative HPLC. The application of these ligands in the diethylzinc addition to aldehydes was investigated. In certain cases, the desired secondary alcohols were obtained in high yield with excellent enantiomeric excess (ee > 99%) at low catalyst
已经开发了新的三齿异喹啉衍生的配体的合成和拆分。合成序列中的关键步骤包括1,3-二氯异喹啉与合适的芳基硼酸的连续,化学选择性的Suzuki-Miyaura交叉偶联。以这种方式制备的新配体可通过与N-苄基钦可丁鎓氯化物与1- [3-(2-(2-羟基苯基)异喹啉-1-基]萘-2-醇的分子络合或通过色谱分离其差向异构樟脑磺酸盐来拆分。 1,3-双-(2-羟基萘-1-基)异喹啉 4-叔通过手性半制备HPLC拆分-丁基-2-氯-6- [1-(2-(羟甲基萘-1-基)异喹啉-3-基]苯酚。研究了这些配体在醛中二乙基锌加成中的应用。在某些情况下,在低催化剂负载量(1摩尔%)下以高收率获得了所需的仲醇,同时具有出色的对映体过量(ee> 99%)。