Synthesis of 2-substituted-5-methyl-pyridines and intermediates

Details Synthesis of 2-substituted-5-methyl-pyridines and intermediates Synthesis of 2-substituted-5-methyl-pyridines and intermediates

1984-09-11

1986-04-22

Bond, Robert T.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546251, 546291, 546188, 546193, C07D21309

Patent

active

045843805

ABSTRACT:
A process for the synthesis of compounds which are known intermediates for the pyridyloxyphenoxy herbicides as well as intermediates used in the process. Propionaldehyde and an acrylic compound, two readily available starting materials, are reacted to form a 2-formylpentanoic compound which is cyclized to a dihydro pyridone which is then oxidized to the 2-hydroxy pyridine. The hydroxypyridine may be halogenated to a 2-halopyridine.

REFERENCES:
Case, "J. Am. Chem. Soc." vol. 68, pp. 2574-2577 (1946).

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