Synthesis and Application of (3<i>R</i>,4<i>R</i>)-3,4-Bis(diphenylphosphino)tetrahydrofuran as Ligand for Asymmetric Hydrogenation of Acrylic Acids
作者:Andreas Terfort
DOI:10.1055/s-1992-26275
日期:——
A new, chiral bisphosphine, (3R,4R)-3, 4-bis(diphenylphosphino)tetrahydrofuran (4), is synthesized in three steps from (R,R)-tartaric acid esters. With rhodium(I) complexes of 4enantiomeric excesses of 54 to 97% are obtained on catalytic hydrogenation of 2-(acetylamino)acrylic acid, 2-(acetylamino)cinnamic acids and itaconic acid. The applied substrate/catalyst ratios were between 250: 1 and 11000:1.
一种新的手性双膦--(3R,4R)-3, 4-双(二苯基膦)四氢呋喃 (4),是由(R,R)-酒石酸酯通过三个步骤合成的。使用铑(I)配合物催化 2-(乙酰氨基)丙烯酸、2-(乙酰氨基)肉桂酸和衣康酸的氢化反应,可获得 54% 至 97% 的 4 对映体过量。应用的底物/催化剂比率介于 250:1 和 11000:1 之间。