Process for the production of 2-(1H-tetrazol-5-yl)-9-hydroxy-1-oxo-1H-naphtho-(2,1-b) pyran and intermediates therefor
US4225722A · kind A · utility
2Cited by
0References
4Claims
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Assignee
Inventors
Key dates
| Filing date | Oct 13, 1977 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Oct 13, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F5/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to Compounds of formula II: ##STR1## wherein Y is formyl, carboxylic acid, acrylic acid, cyano or tetrazolo; X is hydrogen, lower alkanoyl or lower alkyl, and their non-toxic, pharmaceutically acceptable salts are disclosed. These compounds are useful in the prevention of allergic and asthamatic reactions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.