Reactions of 1-aryl- and 2,3-diaryl- 5-diazo-6,6-dimethyl-4-oxo-4,5,6,7-tetra- hydroindazoles with N-ethyl- and N-phenyl-substituted maleimides |
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Authors: | I Strakova M Turks E Bizdena S Belyakov A Tokmakov A Strakovs |
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Institution: | 1.Riga Technical University,Riga,Latvia;2.Latvian Institute of Organic Synthesis,Riga,Latvia |
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Abstract: | 3+2] Cyclocondensation reactions of a series of 1,3- and 2,3-disubstituted 5-diazo-6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazoles
with N-ethyl- and N-phenyl-substituted maleimides have been used to obtain the corresponding 6,6-dimethyl-4,4',6'-trioxo-4,5,6,7-3',3'a,4',5',6',6'a-decahydrospiro-indazole-5,3'-pyrrolo3,4-c]pyrazoles].
On boiling these compounds in toluene nitrogen is split off and they are converted into 6',6'-dimethyl-2,4,4'-trioxo-4',5',6',7'-tetrahydro-1'H-spiro3-azabicyclo-(3.1.0)hexane-6,5'-indazoles]. |
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