Benzopyrans
US4446113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1982 |
| Grant date | May 1, 1984 |
| Priority date | — |
| Expiry date | Sep 24, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/70
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of formula (I): ##STR1## wherein: one of R.sub.1 and R.sub.2 is hydrogen and the other is selected from the class of alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy, alkylhydroxymethyl, nitro, cyano, chloro, trifluoromethyl, alkylsulphinyl, alkylsulphonyl, alkoxysulphinyl, alkoxysulphonyl, alkylcarbonylamino, alkoxycarbonylamino, or aminosulphinyl, aminosulphonyl or aminocarbonyl, the amino moiety being optionally substituted by one or two alkyl groups, or alkylsulphinylamino, alkylsulphonylamino, alkoxysulphinylamino or alkoxysulphonylamino, or ethylenyl terminally substituted by alkylcarbonyl, nitro or cyano or --C(alkyl)NOH or --C(alkyl)NNH.sub.2, the alkyl groups or alkyl moieties of alkyl-containing groups having from 1 to 6 carbon atoms; PA0 one of R.sub.3 and R.sub.4 is hydrogen or alkyl having from 1 to 4 carbon atoms and the other is alkyl having from 1 to 4 carbon atoms, or R.sub.3 and R.sub.4 together with the carbon atom to which they are attached are spiroalkyl having from 3 to 6 carbon atoms; PA0 R.sub.5 is hydrogen, alkyl having from 1 to 3 carbon atoms or acyl having from 1 to 8 carbon atoms; and PA0 n is 1 or 2; the lactam group being trans to the OR.sub.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.