Benzopyran intermediates
US5210234A · kind A · utility
7Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Aug 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D405/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound of the following formula: ##STR1## wherein: R.sub.1 and R.sub.2 is hydrogen or C.sub.1-4 alkyl or R.sub.1 and R.sub.2 together are C.sub.2-5 polymethylene; R.sub.3 is hydroxy, C.sub.1-6 alkoxy or C.sub.1-7 alkylcarbonyloxy; R'.sub.4 is ethyl, isopropyl, t-butyl or cyclopentyl, and R.sup.1.sub.6 is hydrogen or C.sub.1-6 alkyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.