Process for the preparation of pyridine compounds

Details Process for the preparation of pyridine compounds Process for the preparation of pyridine compounds

2007-04-20

2009-10-20

Morris, Patricia L (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07605268

ABSTRACT:
A process for preparation of a compound of formula (I), both as the isomeric mixture and individual isomers,wherein Q is ═CR8— or ═N—; each R1, R2, R3, R4is independently selected from hydrogen, halogen, hydroxy; nitro; C1-C6alkyl optionally substituted with hydroxy; alkylthio C1-C6; C1-C6alkoxy optionally substituted with halogen or C1-C6alkoxy; phenyl-C1-C6alkyl; phenyl-C1-C6alkoxy; and —N(RaRb) wherein each Ra and Rb is independently hydrogen or C1-C6alkyl or Ra and Rb, taken together with the nitrogen atom they are linked to, form a saturated heterocyclic ring; andeach R5, R6, R7, R8is independently selected from hydrogen, halogen, hydroxy; C1-C6 alkyl optionally substituted with hydroxy; alkylthio C1-C6; C1-C6alkoxy optionally substituted with halogen; C1-C6alkyl-carbonyl, C1-C6alkoxy-carbonyl, and oxazol-2-yl; comprising converting a compound of formula (IV),to said compound of formula (I), in the presence of a catalyst, if necessary in an organic solvent.

REFERENCES:
patent: 2 063 705 (1995-01-01), None
Ray et al., “Efficient Synthesis of, etc.,” Synthetic Communications 37, 2861-2868, 2007.
Radl et al., “Synthetic Studies connected, etc.,” J of Heterocyclic Chemistry 43(6), 1447-1453, 2006.

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