Patent US3856777A successfully refreshed from Google Patents.
US3856777A
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Method of producing pyrimidine nucleoside derivatives
Assignee: Ajinomoto Co Inc
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Filing: 1972-12-11
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Granted: 1974-12-24
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Expires: 1992-12-11
Abstract
Abstract Uridine, cytidine, and derivatives thereof arrived at by substitution in positions 4, 5 and 5'' are converted to the corresponding 2,2''-anhydro compounds by reaction with cyclic lower alkylene and alkenylene esters of carbonic acid. The anhydro compounds are hydrolyzed to arabinofuranosylpyrimidine derivatives in a basically known manner. The latter as well as the anhydro compounds are known physiologically active agents and/or intermediates in the synthesis of such agents.
Inventors
- 👤 Y Ishido
- 👤 T Yoshino
- 👤 A Yamasaki
- 👤 M Okutsu
- 👤 H Komura
- 👤 K Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:05
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
A METHOD OF PRODUCING A PYRIMIDINE DERIVATIVE WHICH COMPRISES: REACTING A COMPOUND OF THE FORMULA
Claim 2
Independent Claim
15 words
A METHOD OF PRODUCING A PYRIMIDINE DERIVATIVE WHICH COMPRISES: REACTING A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
22 words
A method as set forth in claim 1, wherein said 2,2''-anhydro derivative is recovered in substantially pure form after said forming thereof.
Claim 4
Dependent Claim
37 words
A method as set forth in claim 1, wherein said compound is reacted with said ester of carbonic acid in the presence of dimethylformamide or diacetylformamide as a solvent substantially at the boiling temperature of said solvent.
Claim 5
Dependent Claim
21 words
A method as set forth in claim 1, wherein said carbonic acid ester is ethylene carbonate, propylene carbonate, or vinylene carbonate.
References Cited (Backward Citations)
US3463850A
Cited
US3705147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |