US3288792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 2, 4-diamino-6-alkylpyrido (2, 3-d) pyrimidines
Assignee: SmithKline Beecham Corp
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Filing: 1964-04-09
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Granted: 1966-11-29
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Expires: 1984-04-09
Abstract
No abstract record available.
Inventors
- 👤 George H Hitchings
- 👤 Bernard S Hurlbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF PREPARING 2,4-DIAMINO-6:R-5,7-UNSUBSTITUTED PYRIDO(2,3-D) PYRIMIDINES THAT COMPRISES REACTING UNDER ANHYDROUS CONDITIONS A 3-TETRIARY AMINO-2-RACROLEIN WITH A REAGENT SELECTED FROM THE CLASS CONSISTING OF PHOSGENE, PHOSPHORYL CHLORIDE AND THIONYL CHLORIDE INITIALLY IN THE COLD AND THEREAFTER WARNING THE REACTION MIXTURE WITH 2,4,6-TRIAMINOPYRIMIDINE AT TEMPERATURES NOT EXCEEDING 100*C., R BEING SELECTED FROM A CLASS CONSISTING OF ALKYL, PHENYL, PHENYL LOWER ALKYL AND LOWER ALKOXY BENZYL, AND WHEREIN R IS FROM 3 TO 9 ATOMS.
Claim 2
Independent Claim
74 words
THE METHOD OF PREPARING 2,4-DIAMINO-6:R-5,7-UNSUBSTITUTED PYRIDO(2,3-D) PYRIMIDINES THAT COMPRISES REACTING UNDER ANHYDROUS CONDITIONS A 3-TETRIARY AMINO-2-RACROLEIN WITH A REAGENT SELECTED FROM THE CLASS CONSISTING OF PHOSGENE, PHOSPHORYL CHLORIDE AND THIONYL CHLORIDE INITIALLY IN THE COLD AND THEREAFTER WARNING THE REACTION MIXTURE WITH 2,4,6-TRIAMINOPYRIMIDINE AT TEMPERATURES NOT EXCEEDING 100*C., R BEING SELECTED FROM A CLASS CONSISTING OF ALKYL, PHENYL, PHENYL LOWER ALKYL AND LOWER ALKOXY BENZYL, AND WHEREIN R IS FROM 3 TO 9 ATOMS.
References Cited (Backward Citations)
DE1040040B
Cited
GB829276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |