申请人:Bayer Aktiengesellschaft
公开号:US05420308A1
公开(公告)日:1995-05-30
According to the invention, a new process has been found for the preparation of 2,2-difluoro-benzo[1,3]-dioxole-carbaldehydes of the formula (I) ##STR1## in which benzo[1,3]dioxole-carbaldehydes are chlorinated, the 2,2-dichloro-dichloromethylbenzo[1,3]dioxoles formed, which are likewise new, are partly fluorinated to give the 2,2-difluoro-dichloromethyl-benzo[1,3]dioxoles, which are likewise new, and these are then reacted with urotropin to give the desired compounds.
根据该发明,已发现了一种用于制备2,2-二氟苯并[1,3]-二氧杂环己烷-甲醛的新工艺,其化学式为(I)##STR1## 在这个工艺中,苯并[1,3]二氧杂环己烷-甲醛被氯化,形成2,2-二氯-二氯甲基苯并[1,3]二氧杂环己烷,这也是新发现的,部分经氟化得到2,2-二氟-二氯甲基苯并[1,3]二氧杂环己烷,同样是新发现的,然后这些化合物与尿囊素反应得到所需的化合物。