| 摘要 |
Disclosed is a production intermediate for safely and efficiently producing an aminoacetylpyrrolidinecarbonitrile derivative. Specifically disclosed is a sulfonyloxyacetylpyrrolidine derivative represented by the following formula (1). [Chemical formula 1] (1) (In the formula, R1 represents an optionally substituted C1-C6 alkyl group, an optionally substituted C3-C6 cycloalkyl group, an optionally substituted arylmethyl group, an optionally substituted aromatic hydrocarbon group, an optionally substituted aromatic heterocyclic ring or an optionally substituted aliphatic heterocyclic ring; R2 represents CONH2 or CN; and X represents CH2, CHF or CF2.)
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