| 摘要 |
Disclosed is a process for efficiently producing a compound represented by formula (I): wherein R<1 >represents aryl, amino, alkyl, or alkoxy; R<2 >represents a protective group of the carboxylic acid; and R<3 >represents an alkali metal, a hydrogen atom, alkyl, aryl, alkylsulfonyl, arylsulfonyl, or trialkylsilyl. This process is characterized by reacting a compound of formula (II) with a compound of formula (III) in the presence of a transition metal compound.
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