US3819612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-substituted adenosine derivatives and the production thereof
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1971-09-23
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Granted: 1974-06-25
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Expires: 1991-09-23
Abstract
Abstract NOVEL 2-SUBSTITUTED ADENOSINE DERIVATIVES HAVING A PROLONGED CORONARY DILATOR AND HYDPOTENSIVE ACTION ARE PROVIDED REPRESENTED BY THE FORMULA 2-R,6-NH2,9-(3,4-DI(HO-),5-(HO-CH2-)TETRAHYDROFUR-2-YL)- PURINE WHEREIN R IS AN ALKYL GROUP OF 2 TO 4 CARBON ATOMS OR PHENYL GROUP HAVING NO SUBSTITUENT OR HAVING, AT LEAST ONE NITRO, HALOGEN, ALKYL OR ALKOXY SUBSTITUENT. A PROCESS FOR THE PREPARATION OF THESE COMPOUNDS IS ALSO PROVIDED INVOLVING REACTING 5-AMINO-1-(B-D-RIBOFURANOSYL)-4-IMIDAZOLECARBONITRILE WITH A NITRILE COMPOUND OF THE FORMULA RCN WHEREIN R IS AS DEFINED ABOVE.
Inventors
- 👤 K Imai
- 👤 M Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:36
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |