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:
Aug. 14, 2012
Filed:
May. 22, 2008
Fuqiang Zhu, Shanghai, CN;
Haihong LI, Shanghai, CN;
Wenzhong Wang, Shanghai, CN;
Hui Zhang, Shanghai, CN;
Jingshan Shen, Shanghai, CN;
Fuqiang Zhu, Shanghai, CN;
Haihong Li, Shanghai, CN;
Wenzhong Wang, Shanghai, CN;
Hui Zhang, Shanghai, CN;
Jingshan Shen, Shanghai, CN;
Topharman Shanghai Co., Ltd., Shanghai, CN;
Weifang Tehua Chemical Co., Ltd., Shandong, CN;
Abstract
The present invention relates to a process for preparing 4-acetyl-2,3,4,5-tetrahydro-benzo[1,4]diazepine and the intermediates thereof. The present invention provides a compound represented by formula I and a compound represented by formula II, and processes for preparing 4-acetyl-2,3,4,5-tetrahydro-benzo[1,4]diazepine by using the compound represented by formula I, the compound represented by formula II and o-nitrobenzaldehyde. The invention has the advantages of the shorter synthesis steps, easily available raw materials and simple operation. Moreover, the process is economic and safe by avoiding the use of expensive and dangerous lithium aluminum hydride.