| 摘要 |
A production process with good efficiency, and applicable to production of a synthetic intermediate of a new quinolone anti-fungus agent CP-99219, is provided. A production process of an intermediate of a new quinolone compound expressed by the formula (IV) <IMAGE> (IV) wherein R3 represents a benzyl group, a diphenylmethyl group, etc. and R4 represents a linear or branched alkyl group of 1 to 8C, a cycloalkyl group, etc. which process employs as a starting substance, a cyclopropanetricarboxylic acid triester expressed by the formula (I) ar or branched alkyl group, a cycloalkyl group, an aryl group or an aralkyl group, and passes through seven steps.
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