Abstract
1. The hydrazides of vicinal phenylethynyl derivatives of N-methylpyrazole-5-carbo-xylic and benzoic acids are respectively cyclized into 6,7-dihydro-6-amino-1-methyl-5-phenylpyrido[3,4-c]pyrazol-7-one and 2-amino-3-benzylideneisoindolin-1-one under the effect of bases. 2. The hydrazide of 4-phenylethynyl-1-methylpyrazole-5-carboxylic acid and the cyclic isomer of tolan-2-carboxylic acid hydrazide, 2-amino-3-benzylideneisoindolin-1-one, are isoraerized in the presence of CuCl with closure of the six-membered pyridazine ring. 3. 6,7-Dihydro-6-amino-1-methyl-5-phenylpyrido[3,4-c]pyrazol-7-one and 2-amino-3-benzylideneisoindolin-1-one are deaminated in oxidation with air in the presence of CuCl.
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