[(4-Oxo-4H-1-benzopyran-3-yl)oxy] acetic acids and derivatives
US4127669A · kind A · utility
5Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Oct 13, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of formula I: ##STR1## wherein Y is hydrogen, lower alkyl, halogen or lower alkoxy; X is carboxy, alkoxycarbonyl, carboxamide, cyano or tetrazolo, and their non-toxic, pharmaceutically acceptable salts are disclosed. These compounds are useful in the prevention of allergic and asthmatic reactions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.