Rigid P-Chiral Phosphine Ligands with <i>tert</i>-Butylmethylphosphino Groups for Rhodium-Catalyzed Asymmetric Hydrogenation of Functionalized Alkenes
作者:Tsuneo Imamoto、Ken Tamura、Zhenfeng Zhang、Yumi Horiuchi、Masashi Sugiya、Kazuhiro Yoshida、Akira Yanagisawa、Ilya D. Gridnev
DOI:10.1021/ja209700j
日期:2012.1.25
prepared in short steps from enantiopure (S)- and (R)-tert-butylmethylphosphine-boranes as the key intermediates. All of these ligands were crystalline solids and were not readily oxidized on exposure to air. Their rhodium complexes exhibited excellent enantioselectivities and high catalytic activities in the asymmetric hydrogenation of functionalized alkenes, such as dehydroamino acid derivatives and enamides
DEVICE AND METHOD FOR EVALUATING ORGANIC MATERIAL FOR ORGANIC SOLAR CELL
申请人:Zhang Zhenfeng
公开号:US20140213800A1
公开(公告)日:2014-07-31
Provided are a novel 1,2-bis(dialkylphosphino)-4,5-(methylenedioxy)benzene derivative that forms a metal complex having particularly high asymmetry induction capacity and catalytic activity on β-dehydroamino acids, a method for manufacturing the same, a metal complex having this 1,2-bis(dialkylphosphino)-4,5-(methylenedioxy)benzene derivative as a ligand, and an asymmetric hydrogenation method using this metal complex. A 1,2-bis(dialkylphosphino)-4,5-(methylenedioxy)benzene derivative represented by general formula (1). (In the formula, R
1
and R
2
represent an alkyl group having 1-10 carbon atoms, and R
1
and R
2
have different numbers of carbon atoms.)