Thiopyrano-benzopyrans, compositions and method of use thereof
US4228173A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1979 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Jul 18, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D335/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are described compounds of formula I, ##STR1## in which an adjacent pair of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 form a chain --COCH.dbd.CE--O--, and the remainder of R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be the same or different, each represent hydrogen, hydroxy, alkyl, halogen, alkenyl, alkoxy, or --NR.sub.1 R.sub.2 in which R.sub.1 and R.sub.2, which are the same or different, are each hydrogen or alkyl, and PA1 E is --COOH, a 5-tetrazolyl group or an (N-tetrazol-5-yl) carboxamido group, PA1 and pharmaceutically acceptable derivatives thereof. There are also described processes for making the compounds and pharmaceutical, e.g. anti-allergic, compositions containing them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.