Process for producing hydrazone derivatives of pyridinaldehydes

Details Process for producing hydrazone derivatives of pyridinaldehydes Process for producing hydrazone derivatives of pyridinaldehydes

1979-05-29

1980-12-02

Rotman, Alan L.

Harness for working animal

546314, 546315, C07D21353

Patent

active

042372755

ABSTRACT:
An improved process for producing pyridinaldehydes and hydrazone derivatives thereof, for example, pyridinaldehyde-phenylhydrazones, is described. This comprises reacting a aminomethylpyridine with an aldehyde or a ketone to give a compound of the formula ##STR1## isomerizing the compound (III), in the presence of suitable catalysts, to a compound of the formula ##STR2## and converting the compound (V), in the presence of an acid and optionally in the presence of a hydrazine, into a pyridinaldehyde or a pyridinaldehyde-hydrazone. It is possible to produce by the process according to the invention pyridinaldehydes and pyridinaldehyde-hydrazones in a simple manner, under mild ecologically favorable conditions and in good to very good yields.

REFERENCES:
patent: 2749351 (1956-06-01), Mathes et al.
patent: 3008963 (1961-11-01), Mathes et al.
patent: 3160633 (1964-12-01), Cislak
patent: 3274206 (1966-09-01), Wilbert et al.
patent: 3573287 (1971-03-01), Schorr et al.

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