Process for preparing 5-cyano-4, 5-dihydro-3,4-dicarboxypyrazole

Details Process for preparing 5-cyano-4, 5-dihydro-3,4-dicarboxypyrazole Process for preparing 5-cyano-4, 5-dihydro-3,4-dicarboxypyrazole

1989-10-17

1990-05-08

Ramsuer, Robert W.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23106

Patent

active

049240013

ABSTRACT:
The present invention provides 5-cyano-4,5-dihydro-3,4-dicarboxypyrazoles and a process for preparing such compounds which comprises reacting a dialkyl fumarate with diazoacetonitrile.

REFERENCES:
patent: 4589905 (1986-05-01), Beck
Kalvoda, Collection of Czechoslovakian Chemistry, 40, 1431 (1970).
Lantos et al., J. Org. Chem., 43(25), 4841 (1978).
Jones et al., J. Org. Chem., 20, 1342 (1955).
Introduction to Organic Chemistry, Streitweiser et al., ed., 1091-1094 (1976).
Pyrazoles, Pyrazolines, Pyrazolidines, Indazoles, and Condensed Rings, Wiley, ed. (1967), pp. 195-200.

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