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。