The Development of a Robust Process for a CRF1 Receptor Antagonist
摘要:
A scalable and robust process was developed for the preparation of pexacerfont (2), a pyrazolotriazine corticotropin-releasing factor receptor 1 antagonist (CRF1). The formation of the core hydroxypyrazolotriazine moiety was achieved through two consecutive cyclizations of a semicarbazide, employing reaction conditions that are significantly milder than those reported in the literature. Further conversion to the key chloropyrazolotriazine intermediate was accomplished through a novel catalytic process using phosphorous oxychloride as the chlorinating agent. The active pharmaceutical ingredient 2 was obtained in > 99.5% purity with a 68% overall yield for the six synthetic steps.
[EN] PROCESSES FOR THE PREPARATION OF PYRAZOLO[1,5-a]-1,3,5-TRIAZINES AND INTERMEDIATES THEREOF [FR] PROCEDES DE PREPARATION DE PYRAZOLO[1,5-a]-1,3,5-TRIAZINES ET LEURS INTERMEDIAIRES
Process for the preparation of pyrazolo[1,5-a]-1,3,5-triazines and intermediates thereof
申请人:Sherbine P. James
公开号:US20070161790A1
公开(公告)日:2007-07-12
The present invention provides novel processes and intermediates for preparing corticotropin releasing factor (CRF) receptor antagonists having the structure below which are useful in treating CRF-related disorders such as anxiety and depression.
[EN] PROCESSES FOR THE PREPARATION OF PYRAZOLO[1,5-a]-1,3,5-TRIAZINES AND INTERMEDIATES THEREOF<br/>[FR] PROCEDES DE PREPARATION DE PYRAZOLO[1,5-a]-1,3,5-TRIAZINES ET LEURS INTERMEDIAIRES