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:
Apr. 02, 1996
Filed:
Mar. 02, 1995
Applicant:
Inventors:
Assignee:
Development Center for Biotechnology, Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549435 ;
Abstract
A method for resolving racemic dimethyl-4,4'-dimethoxy-5,6,5',6'-di(methylenedioxy)biphenyl-2,2'-dicarbox ylate ('DDB'), in which a chiral .alpha.-alkyl benzyl alcohol is used as the resolving agent. More specifically, racemic DDB is first hydrolyzed to form dicarboxylic acid, which is then reacted with chiral .alpha.-alkyl benzyl alcohol to form two chiral isomers. The chiral isomers, after separation either by chromatography or by recrystalli-zation, are respectively hydrogenated and esterified to form chiral DDB isomers.