申请人:DAIICHI SANKYO COMPANY, LIMITED
公开号:US20150239909A1
公开(公告)日:2015-08-27
The present invention relates to an improved and industrially advantageous process for the preparation of (1S, 4S, 5S)-4-bromo-6-oxabicyclo[3.2.1]octan-7-one represented by the following formula (1)
which is a key intermediate in the synthesis of edoxaban, a compound that exhibits on inhibitory effect on activated blood coagulation factor X (also referred to as activated factor X or FXa), and is useful as a preventive and/or therapeutic drug for thrombotic diseases. The process includes reacting (1S)-cyclohex-3-ene-1-carboxylic acid of formula (II) with a brominating agent selected from the group consisting of N-bromosuccinimide or 1,3-dibromo-5, 5-dimethylhydantoin in the presence of a base selected from calcium oxide or calcium hydroxide in a solvent selected from the group comprising of dicholoromethane, toluene, tetrahydrofuran, ethyl acetate, hexanes, cyclopentyl methyl ether (CPME) or a misture thereof to get (1S, 4S 5S)-4-bromo-6-oxabicyclo[3.2.1]octan-y-one of formula (1)
本发明涉及一种改良的、具有工业优势的制备(1S,4S,5S)-4-溴-6-氧代双环[3.2.1]辛-7-酮的方法,该化合物被表示为以下式子(1),是合成依度沙班的关键中间体,依度沙班是一种对活化血凝因子X(也称为活化因子X或FXa)具有抑制作用的化合物,可用作预防和/或治疗血栓性疾病的药物。该方法包括将式子(II)的(1S)-环己-3-烯-1-羧酸与一种溴化剂反应,所述溴化剂选自N-溴代琥珀酰亚胺或1,3-二溴-5,5-二甲基异噻唑酮,以及在以下溶剂中的一种或混合物中,在选择的碱金属氧化物或羟化物中,反应得到式子(1)的(1S,4S,5S)-4-溴-6-氧代双环[3.2.1]辛-7-酮。所述溶剂包括二氯甲烷、甲苯、四氢呋喃、乙酸乙酯、己烷、环戊基甲醚(CPME)或其混合物。