Process for the manufacture of 1-aryl-3-carboxypyrazolid-5-ones

Details Process for the manufacture of 1-aryl-3-carboxypyrazolid-5-ones Process for the manufacture of 1-aryl-3-carboxypyrazolid-5-ones

1976-01-30

1978-06-13

Trousof, Natalie

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23108

Patent

active

040950247

ABSTRACT:
A process for manufacture of 1-aryl-3-carboxypyrazolid-5-one compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each represents H or an alkyl, cycloalkyl, aralkyl or monocyclic aryl group or R.sup.1 and R.sup.2 together form a tetramethylene group; and R represents an aryl group which may be substituted which comprises reacting a hydrazine of the formula R.NH.NH.sub.2 with an ester of the formula: ##STR2## wherein R.sup.3 is an alkyl, cycloalkyl, aralkyl or aryl group, which may be substituted.
The novel process provides better yields and simpler operating conditions than other processes described in the literature for manufacture of these pyrazolidones.

REFERENCES:
patent: 2704762 (1955-03-01), Kendall et al.
patent: 3153654 (1964-10-01), Ficken et al.
patent: 3178441 (1965-04-01), Ficken et al.
Vystrcil et al., Chemical Abstracts, vol. 46, 7566, (1952).
Bouchet et al., Chem. Abst. vol. 68, 1968, 59481q.

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