Tricyclic mono-chromone-2-carboxylic acids
US4238606A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | May 3, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/92
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are described compounds of formula I, ##STR1## in which R.sub.3 represents hydrogen, or alkyl C 1 to 6, PA0 R.sub.S represents hydrogen, hydroxy, alkoxy C 1 to 6, alkanoyloxy C 2 to 6, alkenyloxy C 2 to 6, nitro, --NR.sub.1 R.sub.2, halogen, alkyl C 1 to 6, hydroxy-alkyl C 1 to 6, or hydroxy-alkoxy C 1 to 6, PA0 an adjacent pair of X, Y and Z form a --(CH.sub.2).sub.4 --, --CH.dbd.CH--CH.dbd.CH-- or --O(CH.sub.2).sub.3 -- chain, each of the chains optionally being substituted by one or two C 1 to 6 alkyl groups, and the remaining substituent X or Z represents alkenyl C 2 to 6 optionally substituted by phenyl; halogen; or alkyl C 1 to 9 optionally substituted by one or more of the groups hydroxy, halogen, carbonyl oxygen, phenyl, or alkoxy C 1 to 6, PA0 or, when an adjacent pair of X, Y and Z form a chain substituted by one or two C 1 to 6 alkyl groups, the remaining substituent X or Z may be hydrogen, and PA0 R.sub.1 and R.sub.2, which may be the same or different, are each hydrogen or alkyl C 1 to 6, PA0 and pharmaceutically acceptable derivatives thereof. Processes for making the compounds and pharmaceutical, e.g. anti-allergic, compositions containing the compounds are als…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.