Citation:
Xu Wang, Jun Li, Shengmei Lu, Yan Liu, Can Li. Efficient enantioselective hydrogenation of quinolines catalyzed by conjugated microporous polymers with embedded chiral BINAP ligand[J]. Chinese Journal of Catalysis,
;2015, 36(8): 1170-1174.
doi:
10.1016/S1872-2067(15)60903-2
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Chiral Ir complexes were successfully used in the asymmetric hydrogenation of olefins, ketones, and quinolines. However, almost all the catalytic systems could not tolerate a high catalyst loading because of the formation of an irreversible iridium dimer and trimer during the reaction. It is expected that higher catalytic activity may be achieved if the Ir-complexes were isolated in space. The development of conjugated microporous polymers (CMPs) gives the opportunity for the spatial separation of the complexes. A series of chiral CMPs based on the chiral (R)-BINAP ligand (BINAP-CMPs) with different surface areas were synthesized. The BINAP ligands were separately distributed in the framework and were three times more active than the homogeneous catalyst (TOF 340 h-1 VS 100 h-1) for the asymmetric hydrogenation of quinolines.
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Keywords:
- Enantioselective hydrogenation,
- Quinoline,
- Polymer,
- BINAP,
- Isolation effect
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