Reaction of β??cyano esters with hydrazine hydrate. Unexpected formation of dipyrrolo [1, 2??b: 1′, 2′??e][1, 2, 4, 5] tetrazine, a novel ring system

…, J Karolak??Wojciechowska

Index: Wejroch, Krystyna; Wesolowska, Aneta; Sadowska, Maja; Karolak-Wojciechowska, Janina; Jagodzinski, Tadeusz; Lange, Jerzy Journal of Heterocyclic Chemistry, 2005 , vol. 42, # 5 p. 919 - 924

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Citation Number: 2

Abstract

Abstract Some intermediates and by-products of the title reaction, known to yield 6- hydrazinopyridazine-3-one derivatives, were isolated or detected when the amount of hydrazine hydrate used to react with two model β-cyano esters was reduced to less than two equivalents. N'-(1-amino-4-hydrazino-4-oxo-2-phenylbutyli-dene)-4-hydrazino-4-oxo-2- phenylbutanehydrazonamide and 3, 3, 8, 8-tetramethyl-2, 3, 7, 8-tetrahydro-1H, 6H- ...