Substituted (4-oxo-4H-1-benzopyran-2-yl)cyclopropane carboxylic acids and esters
US4018798A · kind A · utility
2Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | Nov 20, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to substituted [4-oxo-4H-1-benzopyran-2-yl]cyclopropane carboxylic acids and esters having the following structural formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen, alkyl, lower alkoxy, phenyl or when R.sub.1 and R.sub.2 are hydrogen, R.sub.3 and R.sub.4 taken together form an additional aromatic ring and A is hydrogen or ethyl. The compounds of this invention exhibit anti-allergy properties and are indicated in the management of allergic manifestations such as bronchial asthma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.