Title:
METHOD FOR PREPARING TELMISARTAN IMPURITY J
Document Type and Number:
WIPO Patent Application WO/2021/077351
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of chemical pharmaceutical processes, and specifically relates to a method for preparing telmisartan impurity J. The method uses 4-chloro-2-nitro-N-methylaniline as a raw material, and obtains a product by means of the processes of reduction, cyclization, condensation, and hydrolysis and acidification. The raw materials of the method are cheap and readily available, operation is simple, product yield is high and product purity is high.
Inventors:
XUE YI (CN)
XU QIANG (CN)
LI WEISI (CN)
HUANG SHUANG (CN)
LIU LIPING (CN)
JIANG CHUNBAO (CN)
GAO QIAN (CN)
ZHANG XIAOQING (CN)
XU QIANG (CN)
LI WEISI (CN)
HUANG SHUANG (CN)
LIU LIPING (CN)
JIANG CHUNBAO (CN)
GAO QIAN (CN)
ZHANG XIAOQING (CN)
Application Number:
PCT/CN2019/112948
Publication Date:
April 29, 2021
Filing Date:
October 24, 2019
Export Citation:
Assignee:
JIANGSU ZHONGBANG PHARMACEUTICAL CO LTD (CN)
International Classes:
C07D235/18
Domestic Patent References:
| WO2012028925A2 | 2012-03-08 |
Foreign References:
| CN111170947A | 2020-05-19 | |||
| CN101983962A | 2011-03-09 | |||
| CN1623992A | 2005-06-08 |
Attorney, Agent or Firm:
NANJING ZHISHI LAW FIRM OF INTELLECTUAL PROPERTY (CN)
Download PDF: