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作 者:韩在祺 王森 崔佰吉[1] 冯波[1] 姚璐 昌盛[1] HAN Zai-qi;WANG Sen;CUI Bai-ji;FENG Bo;YAO Lu;CHANG Sheng(Jilin Medical University,Jilin 132013,China)
机构地区:[1]吉林医药学院
出 处:《化学试剂》2018年第10期1005-1007,共3页Chemical Reagents
基 金:吉林医药学院大学生创新创业计划项目(2018);吉林市科技创新发展计划项目(201750237)
摘 要:以2-[1-(4-溴苯基)-1-甲基乙基]-4,5-二氢-4,4-二甲基唑为原料,通过与二溴乙烷的格氏反应得到4-[1-(5,5-二氢-4,4-二甲基-2-唑基)-1-甲基乙基]-2-苯乙基溴,再与2-(4-哌啶基)-1H-苯并咪唑在碱性条件下经亲核取代得到比拉斯汀中间体2-(2-(4-(2-(4-(1H-苯并咪唑-2-基)哌啶-1-基)乙基)苯基)丙-2-基)-4,4-二甲基4,5-二氢唑,总收率63%。新工艺不仅避免了正丁基锂、环乙烷等危险试剂的使用,而且降低了安全隐患和环境污染,简化了实验步骤,且操作简便、收率高,适合工业化生产。2-(2-(4-Bromophenyl) propan-2-yl)-4,4-dimethyl-4,5-dihydrooxazole was used as the starting material,2-(2-(4-(2-bromoethyl) phenyl) propan-2-yl)-4,4-dimethyl-4,5-dihydrooxazole was synthesized via Grignard reaction by reacted with 1,2-dibromoethane.The brominated product further reacted with 2-(piperidin-4-yl)-1 H-benzo imidazole in the presences of base to afford 2-(2-(4-(2-(4-(1 H-benzo imidazol-2-yl) piperidin-1-yl) ethyl) phenyl) propan-2-yl)-4,4-dimethyl-4,5-dihydrooxazoe the key intermediate of bilastine with an overall yield of 63%.The process avoids the use of fuming N-butyllithium,ethylene oxide and other dangerous reagents,reduces potential safety hazard and environmental pollution.Furthermore,this process also has some other advantages such as simple operation,high yield,and it is suitable for industrial production.
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