申请人:Dipharma Francis S.r.l.
公开号:EP3521293A1
公开(公告)日:2019-08-07
The present invention relates to a process for the preparation of Crisaborole in a particular crystalline form 1 as an inhibitor of phosphodiesterase 4, in particular of phosphodiesterase 4B (PDE4B), and intermediates useful for its preparation. The claimed process is characterized by preparing the Crisaborole by hydrolysis of the C1-C5-alkyl ester of formula (X):
The crystalline Form 1 is characterized by an XRPD spectrum wherein the most intense peaks, measured using Cu Kα radiation (λ = 1.54 Å), fall at 6.0, 12.1, 14.1, and 15.4 ± 0.2° in 2θ.
本发明涉及一种作为磷酸二酯酶 4,特别是磷酸二酯酶 4B (PDE4B)抑制剂的 Crisaborole 的特殊结晶形式 1 的制备工艺,以及用于制备该工艺的中间体。所述工艺的特点是通过水解式 (X) 的 C1-C5 烷基酯来制备 Crisaborole:
结晶形式 1 的特征在于 XRPD 光谱,其中使用 Cu Kα 辐射(λ = 1.54 Å)测得的最强光峰位于 2θ 的 6.0、12.1、14.1 和 15.4 ± 0.2°。