Catalytic <i>atropo</i>-Enantioselective Reduction of Biaryl Lactones to Axially Chiral Biaryl Compounds
作者:Tomoko Ashizawa、Saiko Tanaka、Tohru Yamada
DOI:10.1021/ol800802c
日期:2008.6.1
The atropo-enantioselective borohydride reduction with dynamic kinetic resolution of biaryl lactones was catalyzed by an optically active beta-ketoiminatocobalt(II) complex to afford optically active biaryl compounds. Chiral HPLC analysis of the starting biaryl lactones was performed at various temperatures to determine suitable reaction conditions for dynamic kinetic resolution. Various types of axially
Catalytic<i>atropo</i>-Enantioselective Preparation of Axially Chiral Biaryl Compounds
作者:Tomoko Ashizawa、Tohru Yamada
DOI:10.1246/cl.2009.246
日期:2009.3.5
The atropo-enantioselective ring-opening of biaryl lactones with methanol was catalyzed by an optically active AgBF4–phosphine complex to afford axially chiral biaryl compounds. The addition of triisobutylamine provided a dramatic rate acceleration in the reaction. Various types of axially chiral biaryl compounds were obtained with high enantioselectivity.
Extraordinary Microwave Effect on <i>atropo</i>-Enantioselective Catalytic Reduction of Biaryl Lactones
作者:Kazuya Nushiro、Satoshi Kikuchi、Tohru Yamada
DOI:10.1246/cl.2013.165
日期:2013.2.5
It was found that microwave irradiation under strictly controlled temperature conditions drastically enhanced the catalytic atropo-enantioselective Corey–Bakshi–Shibata (CBS) reduction of biaryl la...
研究发现,在严格控制的温度条件下,微波辐射极大地增强了对联芳基 la 的催化 atropo-对映选择性 Corey-Bakshi-Shibata (CBS) 还原。
Extraordinary Effect of Microwave Irradiation on Asymmetric Catalysis
We here report the effect of microwave irradiation on the atropo-enantioselective ring-opening reaction of biaryl lactones with dynamic–kinetic resolution catalyzed by AgBF4–phosphine complexes. The multimode microwave reactor with a cooling system was employed and the fiber-optic sensor was used for measurement of the accurate internal reaction temperature. It was found that the reaction was accelerated by microwave irradiation without any loss of enantioselectivity at almost the same internal temperature as the conventional conditions.