‘Diam-BINAP’; a highly efficient monomer for the synthesis of heterogeneous enantioselective catalysts
摘要:
The synthesis of a monomeric analogue of BINAP, diam-BINAP, is described. The polyaddition of this monomer with 2,6-diisocyanato toluene gave the corresponding oligomer, poly-NAP, with a polymerization degree of 8. The ruthenium complex of this polymer proved to be a very efficient heterogeneous catalyst for the hydrogenation of beta-ketoesters (99% ee, 0.1 mol% of catalyst). Furthermore the catalyst could be easily reused four times by simple filtration without loss of activity or enantioselectivity. (C) 2000 Elsevier Science Ltd. All rights reserved.
The invention concerns novel diphosphines of formula (I) useful in particular, in their optically active form, as ligands in metal complexes. The invention also concerns their uses an intermediates in the preparation of polymeric insoluble ligands. The invention further concerns the use of said insoluble ligands in the preparation of metal complexes for asymmetric. catalysis.
The invention concerns a water soluble compound of formula (a) wherein: A represents naphthyl or phenyl; and Ar
1
and Ar
2
independently represent a saturated or aromatic carbocyclic group; X
a
, X
b
are independently selected among an amino group, an ammonium group and an amino group modified by a linear polyoxyalkylene chain, provided that at least one of X
a
and X
b
represents ammonium or modified amino.
Compounds of formula VII are described:
1
wherein A represents phenyl or naphthyl and
Ar
1
and Ar
2
independently represent a saturated or aromatic carbocyclic group. The compounds may be prepared by reducing the nitrile functions of a compound of formula I:
2
描述了式 VII 的化合物:
1
其中 A 代表苯基或萘基,且
Ar
1
和 Ar
2
分别代表饱和或芳香碳环基团。这些化合物可通过还原式 I 化合物的腈基官能团来制备:
2