2,2′,6,6′-tetrasubstituted aminophosphine ligand and its synthesis method
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United States of America Patent
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May 20, 2014
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Aug 10, 2007
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Aug 10, 2006
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Abstract
The present invention relates to a 2,2′,6,6′-tetrasubstituted aminophosphine ligand and its synthesis method. The structure of the ligand is shown as below. Its synthesis method comprises: Step (1) coupling 2,6-dinitrochlorobenzene as the starting material to obtain 2,2′,6,6′-tetranitrobiphenyl; Step (2): hydrogenating the 2,2′,6,6′-tetranitrobiphenyl with Pd/C to obtain 2,2′,6,6′-tetraminobiphenyl; Step (3): reacting the 2,2′,6,6′-tetraminobiphenyl with a phosphine halide to obtain the 2,2′,6,6′-tetrasubstituted aminophosphine ligand. The ligand of the present invention is an achiral compound, and its preparation method is simple. The ligand can be converted to a chiral bimetallic catalyst with single configuration eventually through introduction of external chirality. Moreover, the ligand can be used in various asymmetric reaction catalyzed by metals with high reactivity and stereoselectivity.
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