Catalytic Asymmetric Addition of Dialkylzinc to 3,4-Dihydroisoquinoline<b><i>N</i></b>-Oxides Utilizing Tartaric Acid Ester as a Chiral Auxiliary
作者:Yutaka Ukaji、Yuuko Shimizu、Yuuichi Kenmoku、Alauddin Ahmed、Katsuhiko Inomata
DOI:10.1246/bcsj.73.447
日期:2000.2
The catalytic asymmetric addition of dialkylzinc to a carbon-nitrogen double bond in 3,4-dihydroisoquinoline N-oxides was achieved by utilizing a catalytic amount of 2-magnesium 3-zinc salt of dicyclopentyl (R,R)-tartrate to afford (S)-1-alkyl-2-hydroxy-1,2,3,4-tetrahydroisoquinolines. In order to realize higher enantioselectivity, it was crucial to add the nitrones slowly into dialkylzinc in the presence
通过利用催化量的二环戊基 (R,R)-酒石酸的 2-镁 3-锌盐,实现了二烷基锌与 3,4-二氢异喹啉 N-氧化物的碳-氮双键的催化不对称加成反应,得到 (S )-1-烷基-2-羟基-1,2,3,4-四氢异喹啉。为了实现更高的对映选择性,在催化量的 (R,R)-酒石酸盐的 2-镁 3-锌盐存在下,将硝酮缓慢加入二烷基锌中是至关重要的。