| 摘要 |
The invention relates to a method for producing a compound of formula (I) by reacting a compound of formula (II) with 2-pyrrolidone, whereby a surplus of 2-pyrrolidone, in relation to compound (II), is used. The invention also relates to a method for producing a compound of formula (III), comprising the following steps: (A) production of compound (I); (B) reduction reaction to obtain compound (III) in the form of a salt; (C) release of compound (III) from the salt. (I) (II) (III)
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