Supernucleophilic 4-substituted-pyridine catalysts, and...

Details Supernucleophilic 4-substituted-pyridine catalysts, and... Supernucleophilic 4-substituted-pyridine catalysts, and...

2005-10-25

2005-10-25

Davis, Zinna Northington (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06958400

ABSTRACT:
Processes for preparing a 4-(secondary or tertiary)aminopyridine are provided. The processes comprise reacting a 4-substituted pyridine base having a leaving group as the 4-substituent, with an activating agent so as to form a corresponding 1,4-substituted pyridine; reacting the 1,4-substituted pyridine with a primary or secondary amine to substitute an amino group at the 4-position, and thereby form a corresponding 1-substituted-4-(secondary or tertiary) aminopyridine, wherein the reacting is conducted in a substitution reaction medium essentially free from strong base; and treating the 1-substituted-4-aminopyridine compound to remove the 1-substituent and thereby form a product medium including the 4-(secondary or tertiary) amino-pyridine.

REFERENCES:
patent: WO 9906370 (1999-02-01), None
Delaney et al, Journal of the American Chemical Society, vol. 104, pp. 799-807, 1982.

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