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:
Jun. 14, 1977
Filed:
Jul. 06, 1976
Applicant:
Inventors:
Cesare Casagrande, Como, IT;
Giorgio Ferrari, Milan, IT;
Assignee:
Siphar S.A., Lugano, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
26029353 ;
Abstract
A process is disclosed for the interconversion of alkaloids of the heteroyohimbane group, more particularly of tetrahydroalstonine into raubasine, having the formulae ##STR1## according to which the asymmetry center at C-20 is inverted by several steps involving changes of the ring E structure.