Intermediates for the preparation of pyrazoloazole photographic

Details Intermediates for the preparation of pyrazoloazole photographic Intermediates for the preparation of pyrazoloazole photographic

1994-04-22

1995-10-10

Richter, Johann

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D48704

Patent

active

054572100

ABSTRACT:
There are described intermediates for the preparation of known pyrazoloazole photographic magenta dye forming couplers and processes for making and using these intermediates. The intermediates are low molecular weight compounds represented by the structure: ##STR1## wherein: R, X, R.sup.1 and Y are defined herein.
The process for making these intermediates involves diazotizing a 5-amino-1H-pyrazole to produce a 5-diazo-1H-pyrazole, then condensing the diazotized product with an active methine or methylene compound having a pKa of 14 or less to produce a substituted hydrazone and then subjecting the hydrazone to cyclization and reduction, in either order.

REFERENCES:
patent: 3725067 (1973-04-01), Bailey et al.
patent: 4254132 (1981-03-01), Kramer et al.
patent: 5055586 (1991-10-01), Kim et al.
Elnagdi et al., J. Het. Chem, 14, 227-30 (1977) Apr.
Bailey, J. Chem. Soc. Perk. I 2047-52, (1977) (5).
Farag et al., J. Het. Chem, 24, 1341-44, (1987) Sep.-Oct.

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