Regioselective synthesis of a 1,5-disubstituted pyrazole

Details Regioselective synthesis of a 1,5-disubstituted pyrazole Regioselective synthesis of a 1,5-disubstituted pyrazole

1989-02-06

1990-02-06

Ramsuer, Robert W.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562459, C07D23112

Patent

active

048989525

ABSTRACT:
A highly regioselective synthesis of pyrazoles from a mono-substituted hydrazine and a .beta.-dicarbonyl compound wherein a carboxylic acid moiety is present on the substituent attached to one of the carbonyls. For example, compounds of the formula (I) are formed in marked preference to isomers of formula (IV): ##STR1##

REFERENCES:
patent: 3899508 (1975-08-01), Wikel
patent: 4095025 (1978-06-01), Newberry
patent: 4826868 (1989-05-01), Wachter et al.

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