4,10-Dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carboxylic acids, salts and esters
US4066655A · kind A · utility
2Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Oct 29, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to 4,10-dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carboxylic acids, salts and esters having the formula: ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, halogen, hydroxy or lower alkoxy; R.sub.2 is hydrogen, aralkyl or lower alkyl; R.sub.3 is hydrogen or lower alkyl and their pharmaceutically acceptable salts. These compounds are indicated in the management of allergic conditions such as bronchial asthma, hay fever and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.