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Reactions of 2-hydrazino-1-azaazulenes with acetylacetone gave 2-(3,5-dimethyl-1-pyrazolyl)-1-azaazulenes. Cyclizations of diethyl (1-azaazulen-2-yl)hydrazinomethylenemalonates in refluxing t-butylbenzene or on silica gel gave 1,2,5a-triazacyclohept[a]azulen-5(2H)-ones

Synthesis of 1,2,5a-Triazacyclohept[a]azulen-5(2H)-ones