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US 5,292,885 AGranted
Pyranone, process for its preparation, its use in the preparation of a new pyridinone and a process for the preparation of same
AssigneeIsochem
InventorsDidier G. Wirth, Dominique Gibert, Laurence Ferrucio
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Abstract
2,3,5-(4H)-Trimethyl pyranone having the formula: ##STR1## which is prepared by acetylation of a ketone derived from 2-formyl-3-pentanone and preparation of 2,3,5-(1H)-trimethyl 4-pyridinone having the formula: ##STR2## by ammonolysis of the 2,3,5-(4H)-trimethyl 4-pyranone.
Claims8
2,3,5-(4H)-trimethyl 4-pyranone having the formula:
1-acetoxy-2-methyl-1-pentene-3-one having the formula:
- ##STR10##
2,3,5-(1H)-trimethyl 4-pyridinone having the formula:
- ##STR12##
A process for the preparation of 2,3,5-(1H)-trimethyl 4-pyridinone comprising:
- a) acetylating a ketone derived from 2-formyl-3-pentanone having the general formula:
- ##STR13## where R designates a hydrogen atom, an alkali metal atom, an alkyl group containing from 1 to 8 carbon atoms or an acetyl group
- using acetic anhydride, acetyl chloride or acetyl bromide, at a temperature of between -40.degree. C. and +30.degree. C., to obtain 2,3,5-(4H)-trimethyl 4-pyranone, and
- b) subjecting the 2,3,5-(4H)-trimethyl 4-pyranone obtained in step a) to an ammonolysis.
1 more element
Dependencies are inferred from the claim text.