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:
Feb. 03, 1981
Filed:
Aug. 21, 1979
Applicant:
Inventors:
Assignee:
Canada Packers Limited, , CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602391 ; 544 16 ;
Abstract
A process for preparing ampicillin trihydrate is disclosed which comprises acylating silylated 6-aminopenicillanic acid with D(-)-.alpha.-phenylglycylchloride hydrochloride directly in the silylation reaction mixture in the presence of urea as an acid acceptor, hydrolyzing the reaction product and precipitating ampicillin-trihydrate from the resulting aqueous solution. The amounts of reactants, in particular of solvents and water, are adjusted to provide good yields of a product of high purity.