US3984397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,3-Lower alkylenepenam-3-carboxylic acid derivatives and processes for the preparation thereof
Assignee: Astellas Pharma Inc
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Filing: 1975-06-13
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Granted: 1976-10-05
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Expires: 1995-06-13
Abstract
Abstract A process for the preparation of WHICH COMPRISES REACTING WITH A BASE, WHEREIN Y is a residue of an acid, wherein R1 is amino, (halophenylimino-1-lower alkanoylthiomethyl)amino or acylamino and wherein R2 is carboxy or a protected carboxy, R3 is lower alkyl, R4 is lower alkylene and X is -S- or O ¦ -S-.
Inventors
- 👤 Takashi Kamiya
- 👤 Tsutomu Teraji
- 👤 Masashi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
C; C07; C07D; C07D499/00; C07D499/04; C07D499/21; C07D499/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A process for the preparation of ##SPC19## which comprises reacting ##SPC20## with a base, wherein Y is a residue of an acid obtained by omitting a hydrogen atom from an acid selected from the group consisting of halogen, methanesulfonyloxy, benzenesulfonyloxy, and toluene sulfonyloxy, wherein R 1 is amino (1-halophenylimino-1-lower alkanoylthiomethyl)amino or a conventional penicillin acylamino group and wherein R 2 is carboxy or a conventional penicillin protected carboxy, R 3 is lower alkyl, R 4 is lower alkylene and X is ##EQU2##
Claim 2
Dependent Claim
82 words
A process for the preparation of ##SPC19## which comprises reacting ##SPC20## with a base, wherein Y is a residue of an acid obtained by omitting a hydrogen atom from an acid selected from the group consisting of halogen, methanesulfonyloxy, benzenesulfonyloxy, and toluene sulfonyloxy, wherein R 1 is amino (1-halophenylimino-1-lower alkanoylthiomethyl)amino or a conventional penicillin acylamino group and wherein R 2 is carboxy or a conventional penicillin protected carboxy, R 3 is lower alkyl, R 4 is lower alkylene and X is ##EQU2##
References Cited (Backward Citations)
US3466275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |