Process for stereoselectively reducing 4-aryl-4-oxobutanoic...

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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C564S123000, C564S336000

Reexamination Certificate

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08034961

ABSTRACT:
The present invention relates to a process for preparing stereoisomerically enriched 4-aryl-4-hydroxybutanoic acid derivatives by reducing 4-aryl-4-ketobutanoic acid derivatives in the presence of ruthenium-containing catalysts.

REFERENCES:
patent: 5886181 (1999-03-01), Fuchs et al.
patent: 9157196 (1997-06-01), None
patent: 2000143589 (2000-05-01), None
Genet, et. al.; Tetrahedron letters, 36(27) pp. 4801-4804.
Noyori, et. al., Acc. Chem. Res. 1977, 30, 97-102.
Ramachandran, P., et al.; “Efficient Intramolecular Asymmetric Reductions . . . ”;Org. Lett., 2001, vol. 3, No. 1, pp. 17-18.
Zassinovich et al. Chem Rev. 1992, 92,1051-1069.
March, J., Advanced Organic Chemistry 4th ED John Wiley and Sons, 1992, p. 541.
Wills et al. Tetrahedron Asymmetry 1999, 2045.
Noyari et al. JACS 1996, 118, 2521-2522.
Supporting Information for Above: Noyori et al. Acc Chem Res. 1997, 30,97-102.

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