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US4382086A
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9-Dihydro-11,12-ketal derivatives of erythromycin A and epi-erythromycin A
Assignee: Pfizer Inc
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Filing: 1982-03-01
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Granted: 1983-05-03
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Expires: 2002-03-01
Abstract
Abstract Antibacterial macrolides derived from 9-dihydro-11,12-O-isopropylidene-erythromycin A and 9-dihydro-11,12-O-isopropylidene-4''-epi-erythromycin A.
Inventors
- 👤 Frank C. Sciavolino
- 👤 James R. Hauske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:00
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08; A; A61; A61P; A61P31/00; A61P31/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A compound selected from the group consisting of a macrolide of the formula: ##STR5## and the pharmaceutically acceptable acid addition salts thereof, wherein R is selected from the group consisting of hydrogen, alkanoyl having two to three carbon atoms and ethyl succinyl.
Claim 2
Dependent Claim
42 words
A compound selected from the group consisting of a macrolide of the formula: ##STR5## and the pharmaceutically acceptable acid addition salts thereof, wherein R is selected from the group consisting of hydrogen, alkanoyl having two to three carbon atoms and ethyl succinyl.
Claim 3
Dependent Claim
9 words
A compound of claim 1, wherein R is hydrogen.
Claim 4
Dependent Claim
13 words
The compound of claim 2, wherein the C 4" -hydroxyl group is axial.
Claim 5
Dependent Claim
13 words
The compound of claim 2, wherein the C 4" -hydroxyl group is equatorial.
Claim 6
Dependent Claim
30 words
An antibacterial pharmaceutical composition comprising from about 0.5 to about 90 percent by weight of the total composition a compound as claimed in claim 1 and a pharmaceutically acceptable carrier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |