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HAN Chengqun, ZOU Qiaogen, SUN Qian, XIA Yunyan. Improvement of synthesis process of mirabegron[J]. Journal of China Pharmaceutical University, 2020, 51(4): 449-453. DOI: 10.11665/j.issn.1000-5048.20200409
Citation: HAN Chengqun, ZOU Qiaogen, SUN Qian, XIA Yunyan. Improvement of synthesis process of mirabegron[J]. Journal of China Pharmaceutical University, 2020, 51(4): 449-453. DOI: 10.11665/j.issn.1000-5048.20200409

Improvement of synthesis process of mirabegron

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  • Received Date: May 07, 2020
  • Mirabegron is an agonist of human β-3 adrenergic receptor used to treat symptoms of overactive bladder. In this study, the synthesis process of mirabegron was improved based on literatures. Using p-nitrophenethylamine hydrochloride, (R)-mandelicacid and 2-aminothiazole-4-acetic acid as starting materials, the target product with high purity was obtained through four steps of amide condensation, carbonyl reduction, nitro reduction and amide condensation, and one-step purification, with a total yield of 39%. In this study, the hydrogen source of nitro reduction in step 3 was changed from hydrogen to ammonium formate, which increased the feasibility of industrialization, and mirabegron was refined to improve the purity of the product. The improved process has the advantages of simplified operation and mild reaction conditions, which provides a new method for the preparation and purification of mirabegron.
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