The present invention discloses a process for the preparation of Anastrozole of the formula I in high purity and in high yield. 3,5-bis(halomethyl)toluene is prepared by reacting mesitylene with N-halosuccinimide in the presence of light or dibenzoyl peroxide or azobis isobutyronitrile as a catalyst and in a chlorinated solvent. 3,5-bis(halomethyl)toluene is cyanated with metal cyanide in the presence of a catalyst and in water, organic solvent or mixture thereof at temperature of 40 to 60° C. to obtain 2,2′-(5-methyl-1,3 phenylene)diacetonitrile which is further methylated with iodomethane in the presence of base and an organic solvent at temperature of 0 to 15° C. to obtain 2,2′-(5-methyl-1,3-phenylene)di(2-methyl-propiononitrile). The product obtained is treated with N-halosuccinimide in the presence of a catalyst and in a chlorinated solvent at temperature of 60 to 100° C. to obtain 2,2′-(5-halomethyl-1,3-phenylene)di(2-methyl propionitrile) which was further treated with potassium or sodium salt 1,2,4-triazole at temperature of 20 to 50° C. in dimethyl formamide to obtain crude 2,2′-[5-(
1
H-1,2,4-triazole-1-ylmethyl)-1,3-phenylene]di(2-methyl-propionitrile). The crude product is purified by column chromatography using a stationary phase and a mobile phase followed by recrystallization with a solvent or mixture of solvents to obtain highly pure Anastrozole.
本发明揭示了一种制备高纯度和高产率的
化学式I的
阿那曲唑的方法。首先,通过将
间二甲苯与N-卤代琥珀
酰亚胺在光照或二苯甲酰过氧化物或
异丁腈偶氮叔丁酰胺存在下在
氯化溶剂中反应制备3,5-双(卤甲基)
甲苯。然后,在催化剂的存在下,将3,5-双(卤甲基)
甲苯与
金属
氰化物在
水、有机溶剂或二者混合物中在40至60°C的温度下反应,得到2,2′-(5-甲基-1,3-苯基)双
乙腈。接着,在碱和有机溶剂存在下,在0至15°C的温度下,将2,2′-(5-甲基-1,3-苯基)双
乙腈与
碘甲烷反应甲基化,得到2,2′-(5-甲基-1,3-苯基)双(2-甲基-丙
酰亚胺)。随后,将所得产物在催化剂的存在下,在60至100°C的温度下,与N-卤代琥珀
酰亚胺在
氯化溶剂中反应,得到2,2′-(5-卤甲基-1,3-苯基)双(2-甲基
丙腈)。最后,将该产物与
钾盐或钠盐
1,2,4-三唑在20至50°C的温度下在二甲基甲酰胺中反应,得到粗的2,2′-[5-(
1H-1,2,4-三唑-1-基甲基)-1,3-苯基]双(2-甲基
丙腈)。通过柱层析和再结晶,使用固定相和流动相纯化粗产品,最终获得高纯度的
阿那曲唑。