Bis-chromone-tetrazole/hydroxamic/carboxylic acids
US3948954A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Jan 21, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are described compounds of formula I, ##SPC1## in which PA1 R.sub.1, r.sub.2, r.sub.3, r.sub.4, r.sub.5 and R.sub.6, which may be the same or different, each represent hydrogen, halogen, hydroxy, alkyl C1 to 6, alkoxy C1 to 6, alkenyl C1 to 6; the alkyl and alkoxy groups optionally being substituted by hydroxy, alkoxy C1 to 6, halogen or phenyl, and PA1 X is a hydrocarbon group containing from 2 to 10 carbon atoms, which is optionally interrupted by an oxygen atom, and/or substituted by an -OH group, PA1 Ra is a group -COOH, or ##EQU1## and pharmaceutically acceptable derivatives thereof. There are also described methods of making the compounds and pharmaceutical, e.g. anti-allergic, compositions containing them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.