Patent US4087424A successfully refreshed from Google Patents.
US4087424A
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Novel penicillins and cephalosporins and process for producing the same
Assignee: Toyama Chemical Co Ltd
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Filing: 1975-04-24
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Granted: 1978-05-02
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Expires: 1995-04-24
Abstract
Abstract Novel penicillins and cephalosporins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group in molecule. These compounds are valuable antibacterial compounds for use in mammals including man. This disclosure relates to such compounds and a process for the preparation thereof.
Inventors
- 👤 Isamu Saikawa
- 👤 Shuntaro Takano
- 👤 Chosaku Yoshida
- 👤 Okuta Takashima
- 👤 Kaishu Momonoi
- 👤 Seietsu Kuroda
- 👤 Miwako Komatsu
- 👤 Takashi Yasuda
- 👤 Yutaka Kodama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:52
CPC Classifications
C; C07; C07D; C07D499/00; C07D241/00; C07D241/02; C07D241/06; C07D241/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
An acid halide, acid azide, acid cyanide, cyanomethyl ester or trichloromethyl ester of a compound of the formula, ##STR562## wherein A is a hydrogen atom or a C 1-12 alkyl, C 2-4 alkenyl, phenyl, naphthyl, benzyl or phenethyl group any of which may be substituted by a substituent selected from the group consisting of halogen, hydroxyl, nitro, cyano, pyrrolidino, piperidino, acetyloxy and morpholino; R 2 and R 3 are linked to the same carbon atom; and R 2 and R 3 individually are hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl or octyl.
Claim 2
Dependent Claim
93 words
An acid halide, acid azide, acid cyanide, cyanomethyl ester or trichloromethyl ester of a compound of the formula, ##STR562## wherein A is a hydrogen atom or a C 1-12 alkyl, C 2-4 alkenyl, phenyl, naphthyl, benzyl or phenethyl group any of which may be substituted by a substituent selected from the group consisting of halogen, hydroxyl, nitro, cyano, pyrrolidino, piperidino, acetyloxy and morpholino; R 2 and R 3 are linked to the same carbon atom; and R 2 and R 3 individually are hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl or octyl.
Claim 3
Dependent Claim
13 words
The compound of claim 1, wherein A is a C 1-12 alkyl group.
Claim 4
Dependent Claim
13 words
The compound of claim 1, wherein A is a methyl or ethyl group.
Claim 5
Dependent Claim
9 words
The compound of claim 3 which is 4-ethyl-2,3-dioxo-1-piperazinocarbonyl chloride.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |