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:
Oct. 02, 2012
Filed:
Sep. 19, 2008
Shangzhong Liu, Beijing, CN;
Canxian Mu, Beijing, CN;
Wenjun Wang, Beijing, CN;
Jianwei Chen, Beijing, CN;
Shuguang Wang, Beijing, CN;
Shangzhong Liu, Beijing, CN;
Canxian Mu, Beijing, CN;
Wenjun Wang, Beijing, CN;
Jianwei Chen, Beijing, CN;
Shuguang Wang, Beijing, CN;
Nutrichem Company Limited, Beijing, CN;
Abstract
Preparation method of a compound of general formula (I) comprises the following steps: (1) a compound of general formula (II) reacts with a formylating agent in an aprotic solvent at a temperature between −20° C. and 200° C. in the presence of a Lewis acid, then an organic base is added to promote the reaction to obtain an intermediate product; (2) the above intermediate product reacts with a methylating agent in the presence of an alkali at a temperature between −20° C. and 100° C. to obtain the compound of formula (I).