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. 06, 2004
Filed:
Aug. 12, 2002
Applicant:
Inventors:
Walter Brieden, Brig-Glis, CH;
Michael Gottsponer, Visperterminen, CH;
Assignee:
Lonza AG, Basel, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
C07D / ; C07D / ;
Abstract
A method for producing pyrone derivatives of the general formula (I), wherein X is halomethyl, whereby an acetoacetic acid derivative of the general formula (II), wherein X has the aforementioned meaning and X is chlorine or bromine, is treated with a Lewis acid and is subsequently converted into the desired product by means of water.