US4093617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3,5,7-Trisubstituted pyrazolo[1,5-a]pyrimidines
Assignee: Viratek Inc
•
Filing: 1976-01-28
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Granted: 1978-06-06
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Expires: 1996-01-28
Abstract
Abstract 3,5,7-Trisubstituted pyrazolo[1,5-a]pyrimidines are disclosed of the general formula ##STR1## wherein R 1 is CF 3 or C 1 -C 9 alkyl; R 2 is CF 3 or C 1 -C 9 alkyl; and R 3 is halogen. Such compounds are useful as inhibitors of 3',5'-cyclic AMP phosphodiesterase enzyme.
Inventors
- 👤 Roland K. Robins
- 👤 Darrell E. O'Brien
- 👤 Thomas Novinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
28 words
A compound of the structure ##STR16## wherein R 1 is C 1 -C 3 alkyl; R 2 is C 1 -C 3 alkyl; and R 3 is halogen.
Claim 2
Dependent Claim
28 words
A compound of the structure ##STR16## wherein R 1 is C 1 -C 3 alkyl; R 2 is C 1 -C 3 alkyl; and R 3 is halogen.
Claim 3
Dependent Claim
19 words
A compound of claim 1 wherein R 1 and R 2 are CH 3 and R 3 is halogen.
Claim 4
Dependent Claim
19 words
A compound of claim 2 wherein R 1 and R 2 are CH 3 and R 3 is iodo.
Claim 5
Dependent Claim
19 words
A compound of claim 2 wherein R 1 and R 2 are CH 3 and R 3 is floro.
Claim 6
Dependent Claim
18 words
A compound of claim 1 wherein R 1 and R 2 are ethyl and R 3 is halogen.
Claim 7
Dependent Claim
25 words
A compound of claim 1 wherein one of R 1 or R 2 is methyl and the other is ethyl and R 3 is halogen.
Claim 8
Dependent Claim
1 words
3-Bromo-5,7-dimethylpyrazolo[1,5-a]pyrimidine.
Claim 9
Dependent Claim
1 words
3-Bromo-5,7-dimethylpyrazolo[1,5-a]pyrimidine.
Claim 10
Dependent Claim
1 words
3-Chloro-5,7-dimethylprazolo[1,5-a]pyrimidine.
Claim 11
Dependent Claim
1 words
3-Chloro-5,7-dimethylprazolo[1,5-a]pyrimidine.
References Cited (Backward Citations)
US3920652A
Cited
US3925385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |