FREMGANGSMÅDE TIL FREMSTILLING AF ETORICOXIB

摘要

The present invention provides a improved process for preparing Etoricoxib using substituted ²-chlorovinaniidinium salts containing a cyclic group, optionally containing a heteroatom. The present invention also provides a process for the preparation of the intermediate ²-chlorovinamidinium salts. In one of the embodiments is provided a process for the purification of Etoricoxib as well as the intermediates.