| 摘要 |
Compounds of the formula I or I', where the radicals R1 are each, independently of one another, a hydrogen atom or C1-C4-alkyl and R'1 is C1-C4-alkyl; X1 and X2 are each, independently of one another, a sec-phosphino group; R2 is hydrogen, R01R02R03Si- is halogen-, hydroxyl-, C1-C8-alkoxy- or R04R05N-substituted C1-C18-acyl or is R06-X01-C(O)-; R01, R02 and R03 are each, independently of one another, C1-C12-alkyl, unsubstituted or C1-C4-alkyl-or C1-C4-alkoxy-substituted C6-C10-aryl or C7-C12-aralkyl; R04and R05 are each, independently of one another, hydrogen, C1-C12-alkyl, C3-C8-cycloalkyl, C6-C10-aryl or C7-C12-aralkyl, or R04 and R05 together are trimethylene, tetramethylene, pentamethylene or 3-oxapentylene; R06 is C1-C18-alkyl, unsubstituted or C1-C4-alkyl- or C1-C4-alkoxy-substituted C3-C8-cycloalkyl, C6-C10-aryl or C7-C12-aralkyl; X01 is -O- or -NH-; T is C-bonded C3-C20-heteroarylene; v is 0 or an integer from 1 to 4; X1 in the heteroring of the heteroarylene is bound in the ortho position relative to the T-C* bond; and * indicates a mixture of racemic or enantiomerically pure diastereomers or pure racemic or enantiomerically pure diastereomers. The compounds are excellent chiral ligands for metal complexes as enantioselective catalysts for the hydrogenation of prochiral organic compounds. |
