PROCESS FOR THE PREPARATION OF (R)-4-(1-(6-(4-(TRIFLUOROMETHYL)BENZYL)-6-AZASPIRO[2.5]OCTANE-5-CARBOXAMIDO)-CYCLOPROPYL) BENZOIC ACID OR A SALT THEREOF
申请人:Rottapharm Biotech S.r.l.
公开号:EP3885339A1
公开(公告)日:2021-09-29
The present invention provides a process for preparing (R)-6-(tert-butoxycarbonyl)-6-azaspiro[2.5]octane-5-carboxylic acid (SM1), said process comprising the step of: iv) converting a compound of formula (VII) into a compound of formula (VIII) using a Wittig reagent in a suitable solvent; v) reacting through the Makosza reaction the compound of Formula (VIII) using bromoform and a suitable base to obtain cyclopropane compound of Formula (IX); and vi) removing bromine atoms in the presence of a reducing agent and a base in an alcoholic solvent thus obtaining (SM1). The invention relates also to a process for the conversion of the compound (SM1) for preparing (R)-4-(1-(6-(4-(trifluoromethyl)benzyl)-6-azaspiro[2.5]octane-5-carboxamido)cyclopropyl) benzoic acid (IV) or a salt thereof. The salt is preferably the sodium salt, more preferably the polymorphic form A of sodium (R)-4-(1-(6-(4-(trifluoromethyl)benzyl)-6-azaspiro[2.5]octane-5-carboxamido)-cyclopropyl) benzoate characterized by a powder XRD spectrum with peaks at values of the angle 2θ ±0.2° of 4.3, 5.0, 5.8, 6.4, 7.1, 8.3, 8.7, 12.8, 15.3, 15.9.
本发明提供了一种制备(R)-6-(叔丁氧羰基)-6-氮杂螺[2.5]辛烷-5-羧酸(SM1)的工艺,所述工艺包括以下步骤:iv)使用维蒂希试剂在合适的溶剂中将式(VII)化合物转化为式(VIII)化合物;v)使用溴甲烷和合适的碱通过马科萨反应使式(VIII)化合物反应得到式(IX)环丙烷化合物;和vi)在还原剂和碱存在下在醇溶剂中除去溴原子从而得到(SM1)。本发明还涉及一种将化合物(SM1)转化制备(R)-4-(1-(6-(4-(三氟甲基)苄基)-6-氮杂螺[2.5]辛烷-5-甲酰胺基)环丙基)苯甲酸(IV)或其盐的工艺。该盐优选钠盐,更优选(R)-4-(1-(6-(4-(三氟甲基)苄基)-6-氮杂螺[2.5]辛烷-5-甲酰胺基)环丙基)苯甲酸钠的多晶型 A。5]辛烷-5-甲酰胺基)-环丙基)苯甲酸钠盐,其特征在于粉末 XRD 光谱上的角度 2θ ±0.2° 的峰值为 4.3、5.0、5.8、6.4、7.1、8.3、8.7、12.8、15.3、15.9。