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式I化合物的方法,包括将式IV化合物与
草酸二酯反应,并涉及其中使用的新型中间体化合物。