The invention relates to a crystalline form of 2-chloro-N-2-[3-(2-[(4'-hydroxybiphenyl-3- yl)methyl]amino}-2-oxoethyl)phenyl]-1,1-dimethylethyl}acetamide, a process for preparing the same and its use in the preparation of the 2 agonist N-[(4'-hydroxybiphenyl-3- yl)methyl]-2-(3-2-[((2R)-2-hydroxy-2-4-hydroxy-3- [(methylsulfonyl)amino]phenyl}ethyl)amino]-2-methylpropyl} phenyl)acetamide which is useful in the treatment of respiratory diseases.
该发明涉及一种结晶形式的2-
氯-N-2-[3-(2-[(4'-羟基
联苯-3-基)甲基]
氨基}-2-氧乙基)苯基]-
1,1-二甲基乙基}乙酰胺,以及其制备方法和在制备β2激动剂N-[(4'-羟基
联苯-3-基)甲基]-2-(3-2-[((2R)-2-羟基-2-
4-羟基-3-[(甲磺酰)
氨基]苯基}乙基)
氨基]-2-甲基丙基}苯基)乙酰胺中的应用,该激动剂在呼吸系统疾病治疗中有用。