The invention relates to a novel process for the preparation of the known compound of formula
starting from the compound of formula
as well as to a process for the preparation of the compound of formula IIIb starting from a compound of formula
wherein R1 is lower alkyl, and to novel carbazole intermediates utilized in these processes.
本发明涉及一种制备已知式化合物的新工艺
以及由式
以及以式 IIIb 化合物为起点制备式 IIIb 化合物的工艺。
其中 R1 为低级烷基,以及在这些工艺中使用的新型
咔唑中间体。