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US06861557B2 Process for preparing rac-bicalutamide and its intermediates 失效
外加比卡鲁胺及其中间体的制备方法

Process for preparing rac-bicalutamide and its intermediates
摘要:
The present invention relates to a new process for the synthesis of racemic and optically active bicalutamide starting from ethyl pyruvate and methyl methacrylate. The present invention discloses processes of preparing bicalutamide intermediates including ethyl-[2-{4-fluorophenyl sulfone}]-2-hydroxy propionate, 1,2-epoxy-2-methyl propionate and 2-hydrox-2-methyl-3-(4-fluorophenylthio) propionic acid. The present invention further discloses micronized rac-bicalutamide and the preparation thereof.
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