[EN] 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<br/>[FR] PROCÉDÉ DE PRÉPARATION DE L'ACIDE (R)-4-(1-(6-(4-(TRIFLUOROMÉTHYL)BENZYL)-6-AZASPIRO[2.5]OCTANE-5-CARBOXAMIDO)-CYCLOPROPYL)BENZOÏQUE OU DE SON SEL
申请人:ROTTAPHARM BIOTECH SRL
公开号:WO2021191062A1
公开(公告)日:2021-09-30
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)的方法,该方法包括以下步骤:iv)在适当的溶剂中使用威替试剂将化合物(VII)转化为化合物(VIII);v)通过Makosza反应,使用溴仿和适当的碱反应化合物(VIII)以获得环丙烷化合物(IX);vi)在醇溶剂中存在还原剂和碱的情况下去除溴原子,从而获得(SM1)。该发明还涉及一种将化合物(SM1)转化为制备(R)-4-(1-(6-(4-(三氟甲基)苯基)-6-氮杂螺[2.5]辛烷-5-羧氨基)环丙基)苯甲酸(IV)或其盐的方法。该盐优选为钠盐,更优选为钠的多形式A(R)-4-(1-(6-(4-(三氟甲基)苯基)-6-氮杂螺[2.5]辛烷-5-羧氨基)-环丙基)苯酸盐,其具有在角度2θ ±0.2°处的峰值的粉末XRD谱特征为4.3、5.0、5.8、6.4、7.1、8.3、8.7、12.8、15.3、15.9。