Process for the preparation of 3-anilino-pyrazolones-(5)

Details Process for the preparation of 3-anilino-pyrazolones-(5) Process for the preparation of 3-anilino-pyrazolones-(5)

1973-08-08

1976-05-11

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D23108

Patent

active

039563111

ABSTRACT:
Preparation of 1-aryl-3-anilino-pyrazolones-(5) by reacting a hydrazine with an ester from the group of dialkoxyacrylic acid ester, trialkoxy propionic acid ester or iminoalkoxy propionic acid ester to produce a .beta.-hydrazine-.beta.-alkoxyacrylic acid ester and then condensing this intermediate product with an aniline to result in the desired anilinopyrazolone. These reactions are carried out in a methanolic solution in the presence of an acetic acid catalyst.

REFERENCES:
patent: 2376380 (1942-11-01), Porter et al.
patent: 3127269 (1964-03-01), Greenhalgh et al.
patent: 3470191 (1969-09-01), Eerdekens et al.
Elderfield, Heterocyclic Compounds, (Wiley, N.Y., 1957), Vol. 5, p. 151.
Conant, et al., Chem. of Org. Compounds, (MacMillan, N.Y., 1947), 4th Ed., p. 335.

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