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:
Dec. 27, 2016
Filed:
Jun. 23, 2014
Zhejiang Hisun Pharmaceutical Co., Ltd., Taizhou, CN;
Shanghai Institute of Pharmaceutical Industry, Shanghai, CN;
Fuli Zhang, Shanghai, CN;
Zhezhou Yang, Shanghai, CN;
Rusheng Bao, Taizhou, CN;
Pengcheng Qiu, Shanghai, CN;
Linyong Jin, Shanghai, CN;
Hu Pan, Shanghai, CN;
Linyu Pan, Shanghai, CN;
Dongming Jiang, Taizhou, CN;
Weiwei Xu, Taizhou, CN;
Abstract
The present invention provides a key new intermediate (a compound of formula III) of 4-benzyl-1-phenethyl-piperazine-2,6-dione (formula IV compound), a pharmaceutically acceptable salt thereof and a preparation method thereof. The present invention additionally discloses a method for preparing 4-benzyl-1-phenethyl-piperazine-2,6-dione (formula IV compound) from the formula III compound, said method overcoming the shortcomings of current formula IV compound preparation methods, such as low production volumes, low purity, high energy consumption, high costs, and inability to achieve industrialized production, and provides a formula IV compound preparation method which is simple, economical, environmentally-friendly and easy to produce industrially; the reaction solvent of the method is easily recycled and the method can produce the formula IV compound at high production rates and with high purity.