Patent US3926993A successfully refreshed from Google Patents.
US3926993A
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Process for production of quinazoline derivatives
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-09-05
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Granted: 1975-12-16
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Expires: 1993-09-05
Abstract
Abstract 2(1H)-quinazoline derivatives, which are useful as antiinflammatory, antiviral and uricosuric agents or intermediates for production of other medicines, are prepared by reacting an oxamyl halide derivative with sodium azide.
Inventors
- 👤 Kikuo Ishizumi
- 👤 Kazuo Mori
- 👤 Michihiro Yamamoto
- 👤 Masao Koshiba
- 👤 Shigeho Inaba
- 👤 Hisao Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:15
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/70; C07D239/72; C07D239/78; C07D239/80; C07D239/82; A; A61; A61P; A61P19/00; A61P19/06; A61P29/00; A61P31/00; A61P31/12; C07C; C07C233/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
9 words
A PROCESS FOR PREPARING A QUINAZOLINONE OF THE FORMULA,
Claim 2
Dependent Claim
9 words
A PROCESS FOR PREPARING A QUINAZOLINONE OF THE FORMULA,
Claim 3
Dependent Claim
35 words
A process according to claim 1, wherein the reaction of an oxamyl of the formula with sodium azide is carried out in a solvent under cooling or up to the reflux Temperature of said solvent.
Claim 4
Dependent Claim
22 words
A process according to claim 2, wherein the solvent is methanol, ethanol, propanol, water, chloroform, acetone, dioxane, tetrahydrofuran, or a mixture thereof.
Claim 5
Dependent Claim
15 words
A process according to claim 1, wherein sodium azide is used as an aqueous solution.
References Cited (Backward Citations)
US3712892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |