abstract |
The invention relates to processes for the preparation of a compound of the following formula (I) by reacting a compound of formula (II) with 2-pyrrolidone, 2-pyrrolidone, based on compound (II), being used in excess; and process for the preparation of a compound of the following formula (III), which comprises the following steps: (A) Preparation of Compound (I); (B) reduction reaction, whereby compound (III) is obtained in salt form; (C) Release of compound (III) from the salt. |