| 摘要 |
The present invention relates to a method for producing a compound of the formula [7]wherein R1 is an optionally substituted cycloalkyl group, an optionally substituted aryl group or an optionally substituted heterocyclic group, R2 is a lower alkyl or a halogenated lower alkyl and R3 is a halogen atom or a hydrogen atom. The method of the present invention includes reacting compound [1] with thionyl chloride to give compound [2] and obtaining the objective compound [7] at a high yield via intermediate [5], and is utilizable for industrial production.
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