Patent US3931199A successfully refreshed from Google Patents.
US3931199A
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US
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Benzopyrano and benzothiopyrano [2,3-6] pyridines
Assignee: Tanabe Pharma Corp
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Filing: 1974-03-19
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Granted: 1976-01-06
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Expires: 1994-03-19
Abstract
Abstract Heterocyclic compounds of the formula: ##SPC1## Wherein A is a carbonyl group, a methylene group or an alkylidene group having 2 to 4 carbon atoms; B is an oxygen atom, a sulfur atom or --N(R')-- (wherein R' is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms); each of R 1 and R 2 is a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a phenyl group which may be substituted by a halogen atom, an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; X is an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or OM (wherein M is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a metal atom or NH 4 ); and ring P represents a pyridine ring, are useful as anti-allergic agents.
Inventors
- 👤 Michio Nakanishi
- 👤 Takanori Oe
- 👤 Mineo Tsuruda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:39
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/80; C07D471/00; C07D471/02; C07D471/04; C07D491/00; C07D491/02; C07D491/04; C07D495/00; C07D495/02; C07D495/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
A member selected from the group consisting of chemical compounds of the formula: ##SPC19## wherein A is a carbonyl group; B is an oxygen atom or a sulfur atom; each of R 1 and R 2 is a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a phenyl group or a substituted phenyl group, the substituent being selected from the group consisting of a halogen atom, an alkyl group having 1 to 4 carbon atoms and an alkoxy group having 1 to 4 carbon atoms; X is an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or OM (wherein M is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a metal atom or NH 4 ); and ring P represents a pyridine ring.
Claim 2
Dependent Claim
151 words
A member selected from the group consisting of chemical compounds of the formula: ##SPC19## wherein A is a carbonyl group; B is an oxygen atom or a sulfur atom; each of R 1 and R 2 is a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a phenyl group or a substituted phenyl group, the substituent being selected from the group consisting of a halogen atom, an alkyl group having 1 to 4 carbon atoms and an alkoxy group having 1 to 4 carbon atoms; X is an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or OM (wherein M is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a metal atom or NH 4 ); and ring P represents a pyridine ring.
Claim 3
Dependent Claim
6 words
A compound of claim 1: 7-acetyl-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine.
Claim 4
Dependent Claim
6 words
A compound of claim 1: 7-isobutyryl-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine.
Claim 5
Dependent Claim
6 words
A compound of claim 1: 7-acetyl-2-methyl-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine.
Claim 6
Dependent Claim
6 words
A compound of claim 1: 7-acetyl-2-phenyl-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine.
Claim 7
Dependent Claim
7 words
A compound of claim 1: 5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylic acid.
Claim 8
Dependent Claim
7 words
A compound of claim 1: sodium 5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylate.
Claim 9
Dependent Claim
7 words
A compound of claim 1: 9-chloro-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylic acid.
Claim 10
Dependent Claim
7 words
A compound of claim 1: 9-methyl-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylic acid.
Claim 11
Dependent Claim
7 words
A compound of claim 1: sodium 2-phenyl-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-7-carboxylate.
Claim 12
Dependent Claim
7 words
A compound of claim 1: 5-oxo-5H-[1]benzothiopyrano[2,3-b]pyridine-7-carboxylic acid.
References Cited (Backward Citations)
US3803153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |