US5403923A
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6-0-methylerythromycin A derivatives
Assignee: Taisho Pharmaceutical Co Ltd
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Filing: 1991-11-22
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Granted: 1995-04-04
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Expires: 2011-11-22
Abstract
Abstract PCT No. PCT/JP91/01608 Sec. 371 Date May 20, 1993 Sec. 102(e) Date May 20, 1993 PCT Filed Nov. 22, 1991 PCT Pub. No. WO92/09614 PCT Pub. Date Jun. 11, 1992.This invention provides 6-O-methylerythromycin A derivatives represented by the following formula <IMAGE> (wherein R1 and R2 each represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and A represents a nitrogen atom or a N->O group) and their pharmaceutically acceptable salts. The erythromycin A derivatives have a strong antimicrobial activity against Gram-negative bacteria and have a much stronger activity against Gram-positive bacteria than previously known compounds.
Inventors
- 👤 Masato Kashimura
- 👤 Toshifumi Asaka
- 👤 Shigeo Morimoto
- 👤 Katsuo Hatayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:16
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A 6-O-methylerythromycin A derivative represented by the following formula ##STR6## wherein R 1 and R 2 each represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and A represents a nitrogen atom or a N→O group or a pharmaceutically acceptable salt thereof.
Claim 2
Dependent Claim
47 words
A 6-O-methylerythromycin A derivative represented by the following formula ##STR6## wherein R 1 and R 2 each represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and A represents a nitrogen atom or a N→O group or a pharmaceutically acceptable salt thereof.
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) | 1998-04-03 | 1998-10-03 | 1999-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-03 | 2002-10-03 | 2003-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-03 | 2006-10-03 | 2007-04-04 | $7700.00 | Window Closed / Lapsed |