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Chiral calix[4]arene-based diphosphites as ligands in the asymmetric hydrogenation of prochiral olefins
被引:36
|作者:
Marson, Angelica
Freixa, Zoraida
Kamer, Paul C. J.
van Leeuwen, Piet W. N. M.
[1
]
机构:
[1] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland
[2] Inst Chem Res Catalonia ICIQ, Tarragona 43007, Spain
[3] Univ Amsterdam, Vant Hoff Inst Mol Sci, NL-1018 WV Amsterdam, Netherlands
关键词:
homogeneous catalysis;
stereoselective catalysis;
asymmetric hydrogenation;
calixarenes;
diphosphites;
D O I:
10.1002/ejic.200700764
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
Chiral calixarene-based diphosphite ligands 3a-d have been obtained via lower-rim functionalisation of the p-tert-butylcalix[4]arene core. High enantiomeric excesses (up to 94 %) and good activities were obtained in the rhodium-catalyzed asymmetric hydrogenation of prochiral olefins with TADDOL-containing diphosphites 3c,d. This is the first example of chiral calix[4]arene-modified ligands that induce high enantioselectivity in metal-catalysed asymmetric reactions.
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页码:4587 / 4591
页数:5
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