| 摘要 |
A process for producing an industrially advantageous intermediate for biotin. The process, which is for producing a compound represented by the general formula (I): (I) (wherein R 1 and R2 may be the same or different and each represents hydrogen, benzyl optionally having a substituent on the benzene ring, benzhydryl optionally having a substituent on the benzene rings, or trityl optionally having a substituent on the benzene rings; and R 3 represents cyano, carboxy, alkoxycarbonyl, alkylthiocarbonyl, or optionally substituted carbamoyl) or a salt of the compound, is characterized by causing a compound represented by the general formula (II-a): (II-a) (wherein the symbols have the same meanings as the above) or a salt of the compound to undergo ring conversion.
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