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. 27, 2018
Filed:
Jun. 05, 2015
Zhejiang Hisun Pharmaceutical Co., Ltd., Taizhou, CN;
Hua Bai, Taizhou, CN;
Xuyang Zhao, Chengdu, CN;
Yuncai Zhang, Taizhou, CN;
Xufei Li, Taizhou, CN;
Yong Zhang, Zhejiang, CN;
Dezhou Xu, Taizhou, CN;
Li Zhang, Taizhou, CN;
Xiaojie Xu, Taizhou, CN;
Qifeng Zhu, Taizhou, CN;
Xiaoming Wang, Taizhou, CN;
Zhiqing Yang, Taizhou, CN;
Zehua Zhong, Taizhou, CN;
Jian Zhang, Taizhou, CN;
Abstract
Disclosed is a new method for preparing an azetidinone compound represented by formula (I). The carboxylic ketoester represented by formula (II) serves as the raw material and is subjected to Grignard addition, stereoselective dehydration, ester group reduction, hydroxyl group protection, addition with imine after condensation with a chiral auxiliary, cyclization and deprotection to obtain the compound represented by formula (I). The present invention has advantages of easily available raw material, a few synthetic steps, simple operation, high yield, good stereoselectivity and low cost, and can be used for industrial production.