Process for the Preparation of 2,2'-[5-(1H-1,2,4-Triazole-1-Ylmethyl) -1,3-Phenylene] Di (2-Methylpropionitrile)
申请人:Radhakrishnan Tarur Venkatasubramanian
公开号:US20080207915A1
公开(公告)日:2008-08-28
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。