The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2021
Filed:
Jun. 16, 2017
Zhejiang Huahai Licheng Pharmaceutical Co., Ltd., Taizhou, CN;
Zhejiang Huahai Pharmaceutical Co., Ltd., Taizhou, CN;
Guoliang Tu, Linhai, CN;
Zhongming Xu, Linhai, CN;
Tao Zhou, Linhai, CN;
Wenfeng Huang, Linhai, CN;
Shiwen Zhang, Linhai, CN;
ZHEJIANG HUAHAI LICHENG PHARMACEUTICAL CO., LTD., Linhai, CN;
ZHEJIANG HUAHAI PHARMACEUTICALS CO., LTD., Linhai, CN;
Abstract
Provided is a method for purifying ropinirole hydrochloride (4-2-di-n-propylaminoethyl-1,3-dihydro-2H-indole-2-ketohydrochloride). The method comprises: adding ropinirole hydrochloride containing a monopropyl impurity A into water, adding organic solvent, stirring and dissolving at room temperature, adding alkali, stirring, standing, demixing, and removing an aqueous layer; optionally, drying the organic layer by using anhydrous magnesium sulfate, and filtering; and adding acyl chloride or acid anhydride into the organic layer, stirring, concentrating the organic layer to be dry, adding an organic solvent into the obtained oily matter, adding concentrated hydrochloric acid, and stirring, so as to obtain the ropinirole hydrochloride. By using the method, the impurity A in the ropinirole hydrochloride can be effectively removed, and the ropinirole hydrochloride can be obtained with a high yield and a high purity, so that the impurity A is controlled and the purity of the product reaches a medicinal standard.