Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2007-11-06
2007-11-06
Richter, Johann R (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C546S257000
Reexamination Certificate
active
10754048
ABSTRACT:
A chiral catalyst comprising a 3, 4-disubstituted pyridine, or a salt, N functionalised derivative, dimer or oligomer thereof, wherein the 3-substituent is substantially hindered from rotation about the bond (sp2-sp2biaryl axis) linking it to pyridine and the 4-substituent is an aliphatic or aromatic amine linked by a single bond to the pyridine, the pyridine nitrogen being functionalised or unfunctionalised, preferably comprising a compound of formula Iwherein Z is a group substantially hindered from rotation about its bond; andeach of R1and R2are independently selected from C1-30alkyl, C3-30cyclo alkyl and/or C3-30aryl, or NR1R2form a cyclic amine; wherein R1and/or R2may be optionally substituted and/or include one or more heteroatoms; a composition or support comprising the catalyst; process for the preparation and resolution thereof; process for stereoselective reaction of an optically inactive substrate using the catalyst; and the optically active reaction product thereof.
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Fekner Tomasz
Spivey Alan Christopher
Imperial Innovations Limited
Nagubandi Lalitha
Richter Johann R
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