Regioselective synthesis of a 1,5-disubstituted pyrazole
US4898952A · kind A · utility
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3References
1Claims
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Key dates
| Filing date | Feb 6, 1989 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Feb 6, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C59/90
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.