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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.:

US 4956460 B1

PDFFull Text
Date of Patent:
Sep. 11, 1990

Filed:

Mar. 23, 1988

Process for the preparation of 1-alkyl-3-carboxy-4-cinnolones

Applicant:
Inventors:

Raffaello Fusco, Milan, IT;

Fulvio L Piselli, Milan, IT;

Pier M Boschi, Milan, IT;

Assignee:

Industria Chimica Profarmaco S.p.A., Milan, IT;

Attorney:

Schneider; Walter H.

Primary Examiner:

Mukund J Shah

Assistant Examiner:

E Bernhardt

Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
544234 ; 544235 ; 549439 ; 560 34 ; 562439 ; 562868 ;
Abstract

A process for the preparation of 1-alkyl-3-carboxy-4-cinnolones of formula I ##STR1## wherein R and R.sub.1 are electron donor groups and R.sub.3 is an alkyl group, starting from an amine of formula II ##STR2## which is subjected to the following transformations; (1) diazotation;

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Fusco, Raffaello. (1990). Process for the preparation of 1-alkyl-3-carboxy-4-cinnolones (U.S. Patent No. 4956460). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4956460

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