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US 5,210,234 AGranted
Benzopyran intermediates
AssigneeBeecham Group Limited
InventorsJohn M. Evans, Geoffrey Stemp, Frederick Cassidy
Life of this patent
Estimating the term…
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.
Claims10
A compound of the formula ##STR38## wherein:
- one of R.sub.1 and R.sub.2 is hydrogen or C.sub.1-4 alkyl and the other is 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;
- the R.sup.1.sub.6 NH group being trans to the R.sub.3 group in formula (II) and the bromine atom being trans to the hydroxy group in formula (VIII);
- provided that in formula (IX) R'.sub.4 is not ethyl.
2 more elements
Dependencies are inferred from the claim text.