The invention relates to a new process for the synthesis of high purity 17α-cyanomethyl-17β-hydroxy-estra-4,9-diene-3-one (further on dienogest) of formula (I) from 3-methoxy-17-hydroxy-estra-2,5(10)-diene of formula (V). The invention relates also to the high purity 17α-cyanomethyl-17β-hydroxy-estra-4,9-diene-3-one and pharmaceutical compositions containing that as active ingredient. The pharmaceutical compositions according to this invention contain high purity dienogest of formula (I) in which the total amount of impurities is less than 0.1%, while the amount of 4-bromo-dienogest is under the detection limit (0.02%) as active ingredient or at least one of the active ingredients and auxiliary materials, which are commonly used in practice, such as carriers, excipients or diluents. According to our invention the dienogest of formula (I) is synthesized the following way: i) 3-methoxy-17-hydroxy-estra-2,5(10)-diene of formula (V) is reacted with aluminum isopropylate in the presence of cyclohexanone in an inert organic solvent under heating; ii) the so obtained 3-methoxy-estra-2,5(10)-diene-17-one of formula (IV) is reacted with cyanomethyl lithium at a temperature between 0 and −30° C.; iii) the obtained 3-methoxy-17α-cyanomethyl-17β-hydroxy-estra-2,5(10)-diene of formula (III) is reacted with a strong organic acid in tetrahydrofuran solution; iv) the obtained 17α-cyanomethyl-17β-hydroxy-estr-5(10)-ene-3-one of formula (II) is reacted with 1-1.5 equivalent of pyridinium tribromide in pyridine solution at a temperature between 0 and 60° C., then the obtained crude dienogest of formula (I) is purified by recrystallization and preparative HPLC.
本发明涉及一种从公式(V)的3-甲氧基-17-羟基-麦司卡林-2,5(10)-二烯合成高纯度17α-
氰甲基-17β-羟基-麦司卡林-4,9-二烯-3-酮(以下简称麦司卡林)的新工艺。本发明还涉及高纯度的17α-
氰甲基-17β-羟基-麦司卡林-4,9-二烯-3-酮以及含有其作为活性成分的制药组合物。根据本发明,制药组合物中的高纯度麦司卡林的总杂质量小于0.1%,而4-
溴麦司卡林的量低于检测限(0.02%),作为活性成分或至少一个常用的辅助材料,如载体、赋形剂或稀释剂。根据我们的发明,公式(I)的麦司卡林通过以下方法合成:i)在惰性有机溶剂中,在铝
异丙醇酸的存在下,在
环己酮的加热下,公式(V)的3-甲氧基-17-羟基-麦司卡林-2,5(10)-二烯与反应;ii)所得到的公式(IV)的3-甲氧基-麦司卡林-2,5(10)-二烯-17-酮与
氰甲基锂在0至-30℃的温度下反应;iii)所得到的公式(III)的3-甲氧基-17α-
氰甲基-17β-羟基-麦司卡林-2,5(10)-二烯与强有机酸在
四氢呋喃溶液中反应;iv)所得到的公式(II)的17α-
氰甲基-17β-羟基-麦司卡林-5(10)-烯-3-酮在
吡啶溶液中与1-1.5当量的三
溴化
吡啶反应,在0至60℃的温度下,然后用重结晶和制备性高效
液相色谱法纯化所得到的粗麦司卡林。