US4071531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxathiino- and dithiino-aminoacetic acids
Assignee: Rhone Poulenc Industries SA
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Filing: 1975-09-26
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Granted: 1978-01-31
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Expires: 1995-09-26
Abstract
Abstract New oxathiino- and dithiino-aminoacetic acids of the formula: ##STR1## in which A represents oxygen or sulphur, together with their racemic forms, their optically active forms and mixtures thereof, their reactive derivatives and their acid addition salts, are valuable intermediates for the preparation of therapeutically active derivatives, in particular cephalosporin derivatives of the formula: ##STR2## where R is hydrogen or acetoxy.
Inventors
- 👤 Christian Berger
- 👤 Daniel Farge
- 👤 Georges Gros
- 👤 Mayer Naoum Messer
- 👤 Claude Moutonnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:36
CPC Classifications
C; C07; C07D; C07D339/00; C07D339/08; C07D327/00; C07D327/02; C07D327/06; C12; C12P; C12P17/00; C12P17/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
An oxathiino- or dithiino-aminoacetic acid of formula: ##STR13## in which A is oxygen or sulphur, in racemic or optically active form, as the free acid or as a derivative thereof selected from an acid addition salt, an acid halide, and the anhydride.
Claim 2
Dependent Claim
42 words
An oxathiino- or dithiino-aminoacetic acid of formula: ##STR13## in which A is oxygen or sulphur, in racemic or optically active form, as the free acid or as a derivative thereof selected from an acid addition salt, an acid halide, and the anhydride.
Claim 3
Dependent Claim
10 words
A compound according to claim 1 which is DL-α-amino-(5,6-dihydro-1,4-dithiin-2-yl)-acetic acid.
Claim 4
Dependent Claim
10 words
A compound according to claim 1 which is D-α-amino-(5,6-dihydro-1,4-dithiin-2-yl)-acetic acid.
Claim 5
Dependent Claim
10 words
A compound according to claim 1 which is DL-αamino-(5,6-dihydro-1,4-oxathiin-2-yl)-acetic acid.
Claim 6
Dependent Claim
10 words
A compound according to claim 1 which is L-α-amino-(5,6-dihydro-1,4-dithiin-2-yl)acetic acid.
References Cited (Backward Citations)
US3928595A
Cited
US3966718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |