Heterocyclic esters of benzopyrans
US3941782A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1973 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | May 21, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/94
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to novel esters of benzopyrans represented by the formulae ##SPC1## Wherein R and R' are hydrogen or C.sub.1 -C.sub.6 alkyl and when alkyl are on the same or different carbons; R.sub.1 is C.sub.1 -C.sub.6 alkyl; R.sub.2 is C.sub.1 -C.sub.20 alkyl, lowercycloalkyloweralkyl or lowercycloalkyl; n is an integer from 3 to 7, and particularly 3 to 5; Y is a straight or branched chain C.sub.1 -C.sub.8 alkylene; and R.sub.3 is ##EQU1## WHEREIN A IS AN INTEGER FROM 1 TO 4, B IS AN INTEGER FROM 1 TO 4, X is O,S, CH.sub.2 or NR.sub.4 and R.sub.4 is hydrogen C.sub.1 -C.sub.6 alkyl, and R.sub.5 is hydrogen or C.sub.1 -C.sub.6 alkyl; and the acid addition salts thereof. The compounds exhibit analgesic and central nervous system activity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.