申请人:BASF Aktienegesellschaft
公开号:US06359165B1
公开(公告)日:2002-03-19
Enantiomerically pure &bgr;-hydroxy esters are prepared by a process in which &bgr;-keto esters are reacted with hydrogen in the presence of catalysts of the formula LRuX2 where
X is halogen, acetate, allyl, methallyl, 2-phenylallyl, perchlorate, trifluoroacetate, tetrafluoroborate, hexafluoroantimonate, hexafluorophosphate, hexafluoroarsenate or trichloroacetate,
L is a bidentate phospholane of the formula I
where
B=a bridging link with 1-5 carbon atoms between the two phosphorus atoms,
R1=H, C1-C6-alkyl, aryl, alkylaryl or SiR23,
R2=alkyl or aryl,
m=0 or 1,
R3=H or OR4, and
R4=R1,
with the proviso that if m=1 then R3=H and if m=0 then R3 ≠ H.
对映纯度的β-羟基酯通过以下过程制备:在催化剂LRuX2存在下,β-酮酯与氢反应,其中
X为卤素、乙酸酯、烯丙基、甲基烯丙基、2-苯基烯丙基、高氯酸盐、三氟乙酸盐、四氟硼酸盐、六氟锑酸盐、六氟磷酸盐、六氟砷酸盐或三氯乙酸盐,
L为具有以下式I的双齿膦烷
其中
B=连接两个磷原子的1-5个碳原子的桥链,
R1=H、C1-C6-烷基、芳基、烷基芳基或SiR23,
R2=烷基或芳基,
m=0或1,
R3=H或OR4,以及
R4=R1,
但条件是如果m=1,则R3=H,如果m=0,则R3≠H。