The present invention is concerned with a novel process for the preparation of compounds of formula I
1
comprising bromomethylation or chloromethylation of a compound of formula II
2
and subsequent reaction with a compound of formula IV
3
The compounds of formula I and the corresponding salts, e.g. the sodium salts, are pharmaceutically active substances.
本发明涉及一种制备I1式化合物的新工艺,包括对II2式化合物进行
溴甲基化或
氯甲基化,然后与I
V3式化合物发生反应。式I化合物及其相应的盐,例如
钠盐,是药用活性物质。