应用化学

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(R)-1-(4- 苄氧基-3- 硝基苯基)-2- 溴乙醇制备工艺的改进

张宝华,史兰香*   

  1. (石家庄学院化工学院 石家庄 050035)
  • 收稿日期:2013-01-04 修回日期:2013-03-20 出版日期:2013-11-10 发布日期:2013-11-10
  • 通讯作者: 史兰香,教授; Tel:0311-66617320; E-mail:kedashilanxiang@163.com; 研究方向:药物合成
  • 基金资助:
    河北省科技支撑项目(07215603D,13964002D)

New Preparation Process for (R)-1-(4-Benzyloxy-3-nitrophenyl)-2-bromoethanol

ZHANG Baohua, SHI Lanxiang*   

  1. (College of Chemical Engineering,Shijiazhuang University,Shijiazhuang 050035,China)
  • Received:2013-01-04 Revised:2013-03-20 Published:2013-11-10 Online:2013-11-10

摘要: 以4-苄氧基-3-硝基-α-溴代苯乙酮为原料,在聚苯乙烯磺酰胺化固载的(R)-二苯基脯氨醇形成的噁唑硼烷催化下,经NaBH4/Me3SiCl不对称还原制得了(R,R)-福莫特罗的关键中间体(R)-1-(4-苄氧基-3-硝基苯基)-2-溴乙醇,收率95%,ee值95.4%。 手性氨基醇可以方便的分离和回收利用,降低了生产成本。 用NaBH4/Me3SiCl为还原剂代替BH3,降低了毒性,提高了安全性。

关键词: (R)-(苄氧基-硝基苯基)-溴乙醇, NaBH4/Me3SiCl, 不对称还原, 固载(R)-二苯基脯氨醇

Abstract: (R)-1-(4-Benzyloxy-3-nitrophenyl)-2-bromoethanol, a key intermediate for the preparation of (R,R)-formoterol, was prepared from 4-benzyloxy-3-nitrophenyl-α-bromoacetophenone using BH3 complex with polymer-bonded (R)-diphenylpyrrolidinemethanol as the catalyst and NaBH4/Me3SiCl as reductant via an enantioselective reduction. The yield and ee value for the reaction are 95% and 95.4% respectively. The resulted chiral compounds can be easily separated and recycled, which reduce the production cost. Using NaBH4/Me3SiCl as the reductant could minimize the toxicity of the reaction and help to improve the safety issue.

Key words: (R)-(benzyloxy-nitrophenyl)-bromoethanol, NaBH4/Me3SiCl,enantioselective reduction,bonded (R)-diphenylpyrrolidinemethanol

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