申请人:Iding Hans
公开号:US20090326253A1
公开(公告)日:2009-12-31
The invention is concerned with new phosphine ligands of the formula I
wherein
R
1
and R
2
are independently of each other alkyl, aryl, cycloalkyl or heteroaryl, said alkyl, aryl, cycloalkyl or heteroaryl may be substituted by alkyl, alkoxy, halogen, hydroxy, amino, mono- or dialkylamino, aryl, —SO
2
—R
7
, —SO
3
−
, —CO—NR
8
R
8′
, carboxy, alkoxycarbonyl, trialkylsilyl, diarylalkylsilyl, dialkylarylsilyl or triarylsilyl;
R
3
is alkyl, cycloalkyl, aryl or heteroaryl; R
4′
and R
4
signify independently of each other hydrogen, alkyl or optionally substituted aryl; or R
4′
and R
4
together with the C-atom they are attached to form a 3-8-membered carbocyclic ring; dotted line is absent or is present and forms a double bond; R
5
and R
6
are independently of each other hydrogen, alkyl or aryl; or linked together to form a 3-8-membered carbocyclic ring or an aromatic ring; R
7
is alkyl, aryl or NR
8
R
8′
; and R
8
and R
8′
are independently of each other hydrogen, alkyl or aryl;
metal complexes with such ligands as well as the use of such metal complexes as catalysts in asymmetric reactions.