The invention relates to a sitagliptin intermediate preparation method, the method in two thionyl chloride under the action of the (S) - 1, 2, 3, 4 - four - 1 - naphthoic acid hydrogen and 7 - 3 - amino - 1 - oxygen - 4 - (2, 4, 5 three - difluorophenyl) - butyl - 5, 6, 7, 8 - four H - 3 - (1 - three - 1, 2 methyl fluoride), 4 - three of 4, 3 - A and pyrazine reaction, after the reaction distillation fractions obtained in ethyl acetate, acetonitrile and methanol the mixed solvent reflux and hydrogen chloride gas into 0 ~ 50 DEG C by rapid filtration, sitagliptin intermediate. Compared with the prior art, the invention has reasonable process, simple operation, safe, easy, cheap raw materials, high pressure hydrogenation catalyst is expensive and dangerous, under the premise of ensuring the overall yield and product quality, reduce production cost, operation difficulty and environmental pollution, being conducive to industrial production of sitagliptin.
【技术实现步骤摘要】
【技术保护点】
一种西他列汀中间体的制备方法,其特征在于,该方法包括以下步骤: (1)在20~50℃下,将(S)-1,2,3,4-四氢-1-萘甲酸溶解在N,N-二甲基甲酰胺和甲苯的混合液中,缓慢滴加二氯亚砜,加毕,在30~80℃搅拌1-5个小时,蒸馏 ,再加入甲苯; (2)将7-[3-氨基-1-氧-4-(2,4,5-三氟苯基)-丁基]-5,6,7,8-四氢-3-(1-三氟甲基)-1,2,4-三唑[4,3-a]并吡嗪加入上述溶液中,在30~80℃搅拌1-5个小时,加入乙酸乙酯,冷却到 室温,加入水和氢氧化钠,分离,水层用乙酸乙酯萃取,合并有机层,用无水硫酸钠干燥,过滤,蒸出溶剂,收集213~217℃的馏分; (3)将上述馏分加入乙酸乙酯、乙腈和甲醇的混合溶剂中,加热回流溶解,通入氯化氢气体,至固体析出,停止加热,继 续通氯化氢气体,体系降温,0~50℃下快速过滤,得到西他列汀中间体。
【技术特征摘要】
【专利技术属性】
技术研发人员:傅志伟,
申请(专利权)人:上海博康精细化工有限公司,
类型:发明
国别省市:31[中国|上海]
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