Ligand, method for producing the same, and catalyst using...

Details Ligand, method for producing the same, and catalyst using... Ligand, method for producing the same, and catalyst using...

2007-03-02

2010-10-26

Witherspoon, Sikarl A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus containing

C568S015000, C502S158000, C502S162000, C502S167000, C502S171000

Reexamination Certificate

active

07820862

ABSTRACT:
Disclosed is a novel asymmetric ligand which can be synthesized by a short process at low cost and is capable of exhibiting higher catalytic activity and enantioselectivity than the conventional ligands derived from sugars. Also disclosed are a method for producing such an asymmetric ligand, and a catalyst using such an asymmetric ligand. Specifically disclosed is a ligand represented by the general formula I below or the like. (In the formula, R1and R2independently represent 0-5 substituents; X represents P, As or N; m represents an integer of 0-7; n represents an integer of 0-3; A1-A4independently represent hydrogen, fluorine, chlorine, bromine, benzoyl or acetyl, or alternatively A2and A3combine together to form a ring.)

REFERENCES:
patent: 6677461 (2004-01-01), Shibasaki
patent: 2003/0119659 (2003-06-01), Shibasaki
patent: 2002-255985 (2002-09-01), None
patent: 2003-212887 (2003-07-01), None
patent: 2004-123624 (2004-04-01), None
Fujimori, I., et al.,“Key Role of the Lewis Base Position in Asymmetric Bifunctional Catalysis: Design and Evaluation of a New Ligand for Chiral Polymetallic Catalysts,” Journal of the American Chemical Society 128(51):16438-16439, 2006.

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