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        Synthesis  2003(15): 2349-2352  
DOI: 10.1055/s-2003-42413
   DOI: 10.1055/s-2003-42413
PAPER
© Georg Thieme Verlag Stuttgart · New YorkAmmonium Cerium(IV) Nitrate as an Efficient Oxidizing Agent for Fused 1,4-Dihydropyridazine Derivatives and Hydrazides
Further Information
            
               
                  
                        
                              Received
                              12 June 2003 
                      
Publication Date:
29 September 2003 (online)
            
         
      
   Publication History
Publication Date:
29 September 2003 (online)

Abstract
A simple method for the aromatization of a fused 1,4-dihydropyridazine ring as well as a concomitant oxidation of a carbohydrazido group into the corresponding esters is presented. In particular, 1,4,6,7,8,9-hexahydro-5H-pyridazino[4,3-c]azepine-3-carboxylic acid hydrazides 1 are rapidly oxidized using six equivalents of ammonium cerium(IV) nitrate (CAN) in different alcohols to the corresponding fused pyridazine esters 3.
Key words
heterocycles - dehydrogenations - esters - oxidations - ammonium cerium(IV) nitrate - fused pyridazines
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