Benzopyranyltetrazoles
US3933845A · kind A · utility
0Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1971 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | Aug 26, 1991 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F1/005
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are described compounds of formula I, ##SPC1## PA1 in which R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be the same or different, are hydrogen, alkyl C2 to 6, alkoxy C2 to 8, hydroxy-alkoxy C3 to 8, and R.sub.5 may be hydroxy, provided that one or two of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are other than hydrogen, PA1 And pharmaceutically acceptable derivatives thereof. The compounds of formula I are indicated for use in the treatment of asthma, and pharmaceutical compositions containing them and processes for their preparation are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.