US4614802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
6-substituted amino-4H-pyrano(3,2-G)quinoline-2,8-dicarboxylic acid intermediates
Assignee: Fisons Ltd
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Filing: 1984-06-04
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Granted: 1986-09-30
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Expires: 2004-06-04
Abstract
Abstract Disclosed are compounds of the formula ##STR1## in which R is hydrogen or alkyl C 1 to C 6 and R 5 and R 10 , which may be the same or different, are hydrogen or alkyl C 1 to C 6 , X represents a group --AR 6 , A is CO or SO 2 and R 6 is halogen, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy, C 6 -C 9 aryloxy or phenyl optionally substituted by C 1 -C 6 alkyl, and salts, esters, and amides which are intermediates to anti-allergic compounds.
Inventors
- 👤 Robert G. M. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:41
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; A; A61; A61P; A61P37/00; A61P37/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A compound of the formula ##STR5## in which R is hydrogen or alkyl C 1 to C 6 and R 5 and R 10 , which may be the same or different are hydrogen or alkyl C 1 to C 6 , X represents a group --AR 6 , A is CO or SO 2 and R 6 is halogen, haloalkyl C 1 to C 6 , alkoxy C 1 to C 6 , phenoxy optionally substituted by halogen or phenyl optionally substituted by alkyl C 1 to C 6 , or a salt, ester or amide thereof.
Claim 2
Dependent Claim
98 words
A compound of the formula ##STR5## in which R is hydrogen or alkyl C 1 to C 6 and R 5 and R 10 , which may be the same or different are hydrogen or alkyl C 1 to C 6 , X represents a group --AR 6 , A is CO or SO 2 and R 6 is halogen, haloalkyl C 1 to C 6 , alkoxy C 1 to C 6 , phenoxy optionally substituted by halogen or phenyl optionally substituted by alkyl C 1 to C 6 , or a salt, ester or amide thereof.
Claim 3
Dependent Claim
10 words
A compound according to claim 1 wherein X is 4-toluenesulphonyl.
Claim 4
Dependent Claim
16 words
A compound according to claim 1, wherein R 5 represents hydrogen and R 10 represents propyl.
References Cited (Backward Citations)
GB2022078A
Cited
US4356181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |