The present invention relates to a process for the preparation of a compound of the formula (I), which comprises reacting a compound of the formula (IV) with an oxalic acid diester and to novel intermediate compounds used therein.
本发明涉及一种制备化合物(I)的方法,包括将化合物(IV)与
草酸二酯反应,以及在其中使用的新型中间化合物。