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US 4,060,533 AGranted
Pyranone carboxamides
AssigneeSandoz Ltd.
InventorJeffrey Nadelson
Life of this patent
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Abstract
Pyranone carboxamides, e.g., 2,6-diphenyl-N-methyl-4-oxo-4H-pyran-3-carboxamide, are prepared by cyclizing and dehydrogenating 2-aminomethylene-5-hydroxy-N-methyl-3-oxo-alkylamides and are useful as anti-allergic agents.
Claims4
A compound of the formula ##STR8## where R.sub.1 and R.sub.2 represent
- where ##STR9## R.sub.4 is hydrogen, halogen having an atomic weight of from 19 to 36, lower alkoxy or lower alkyl;
- and
- R.sub.3 is lower alkyl.
A compound of the formula ##STR10## where R.sub.1 and R.sub.2 each independently is lower alkyl or ##STR11## where R.sub.4 is hydrogen, halogen having an atomic weight of from 19 to 36, lower alkoxy or lower alkyl;
- and
- R.sub.3 is lower alkyl.
Dependencies are inferred from the claim text.