US3883545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain 1-hydroxy-2-pyridones
Assignee: Hoechst AG
•
Filing: 1972-12-22
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Granted: 1975-05-13
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Expires: 1992-12-22
Abstract
Abstract New 1-hydroxy-2-pyridones of the general formula IN WHICH R1 is alkyl of 1 to 17 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, cyclohexylalkyl or phenalkyl both having 1 to 3 carbon atoms in the alkylene chain or Alpha -furyl, all of which may be substituted by halogen and R2 to R4 are hydrogen or lower alkyl or 2 adjacent substituents together form a trimethylene or tetramethylene chain, and in which R1 to R4 together contain at least 2 carbon atoms, are prepared by contacting unsaturated delta -keto esters or mixtures thereof with hydroxylamine and subjecting the products to cyclization. The compounds exhibit antimycotic properties.
Inventors
- 👤 Gerhard Lohaus
- 👤 Walter Dittmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:49
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
5 words
A 1-HYDROXY-2-PYRIDONE OF THE FORMULA
Claim 2
Dependent Claim
5 words
A 1-HYDROXY-2-PYRIDONE OF THE FORMULA
Claim 3
Dependent Claim
6 words
A compound of the formula II
Claim 4
Dependent Claim
6 words
A compound of the formula II
Claim 5
Dependent Claim
1 words
1-Hydroxy-4-methyl-6-heptyl-2-pyridone.
Claim 6
Dependent Claim
1 words
1-Hydroxy-4-methyl-6-heptyl-2-pyridone.
Claim 7
Dependent Claim
1 words
1-Hydroxy-4-methyl-6-undecyl-2-pyridone.
Claim 8
Dependent Claim
1 words
1-Hydroxy-4-methyl-6-undecyl-2-pyridone.
Claim 9
Dependent Claim
1 words
1-hydroxy-4-methyl-6-cyclohexyl-2-pyridone.
Claim 10
Dependent Claim
1 words
1-hydroxy-4-methyl-6-cyclohexyl-2-pyridone.
Claim 11
Dependent Claim
1 words
1-hydroxy-4-methyl-6-cyclohexylmethyl-2-pyridone.
Claim 12
Dependent Claim
1 words
1-hydroxy-4-methyl-6-cyclohexylmethyl-2-pyridone.
Claim 13
Dependent Claim
3 words
1-hydroxy-4-methyl-6-( Beta -cyclohexylethyl)-2-pyridone.
Claim 14
Dependent Claim
3 words
1-hydroxy-4-methyl-6-( Beta -cyclohexylethyl)-2-pyridone.
Claim 15
Dependent Claim
1 words
1-hydroxy-4-methyl-6-(4-chlorobenzyl)-2-pyridone.
Claim 16
Dependent Claim
1 words
1-hydroxy-4-methyl-6-(4-chlorobenzyl)-2-pyridone.
Claim 17
Dependent Claim
3 words
1-hydroxy-4-methyl-6-( Alpha -furyl)-2-pyridone.
Claim 18
Dependent Claim
3 words
1-hydroxy-4-methyl-6-( Alpha -furyl)-2-pyridone.
References Cited (Backward Citations)
US3637722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |