The invention relates to a preparing method of the glipizide impurity I. In the method, 4-(2-aminoethyl) benzsulfamide is used as a raw material and reacts with cyclohexyl isocyanate in two steps to obtain the glipizide impurity I. The method is simple and easy to implement, and provides an impurity I comparison product meeting the requirement for glipizide quality control.
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Paragraph 0018; 0019; 0020
(2017/05/25)
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