Process for preparing 3-carbalkoxy-4-pyrone derivatives

Details Process for preparing 3-carbalkoxy-4-pyrone derivatives Process for preparing 3-carbalkoxy-4-pyrone derivatives

C - Chemistry, Metallurgy

07

D

260/356.6

C07D 309/38 (2006.01)

Patent

CA 1115283

Abstract of the Disclosure A process is described for preparing compounds of the formula Image wherein R is a (C1-C4) alkyl group, R2 is a (C1-C4) alkyl group, R6 is a hydrogen atom or a (C1-C4) alkyl group, and R8 is a hydrogen atom, a halogen atom, or a (C1-C4) alkyl group. The process comprises reacting a compound of the formula Image wherein R6 and R8 are as defined above, R9 is a halogen atom, and X is a halogen atom or an acetyl group, with a .beta.-ketoester salt of the formula Image wherein R and R2 are as defined above and M is a cation, in an inert solvent at a temperature of from about 0°C to the reflux temperature of the solvent. The above compounds are useful as intermediates for the preparation of 1-aryl-4-pyridone compounds which are active as plant growth regulators, and particularly as chemical hybridiza- tion agents.

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