A telescoped protocol for the synthesis of new pyrrolo [3,4-d]pyridazinones by cascade reactions
作者:Helio G. Bonacorso、Francieli M. Libero、Gean M. Dal Forno、Everton P. Pittaluga、Liliane M.F. Porte、Marcos A.P. Martins、Nilo Zanatta
DOI:10.1016/j.tetlet.2015.07.035
日期:2015.9
hydrazines to the ketone group present in the pyrroles previously formed, followed by intramolecular cyclization with the bordering ester, which furnishes the respective pyrrolo[3,4-d]pyridazinones, substituted at the pyrrole and/or pyridazinone rings. All transformations occur in a two-step one-pot methodology, and a series of ten new compounds were obtained at yields of 42–87%.
提出了一种新的一锅法,用于合成多取代的吡咯并[3,4- d ]哒嗪酮。该方案包括在相同的介质中进行的级联反应:(i)通过叠氮化物乙烯基与1,3-二羰基化合物的反应,通过1,3-二羰基化合物的1,2-加成反应形成的热原位吡咯2 H-叠氮基中间体; (ii)将肼亲核加成到先前形成的吡咯中存在的酮基上,然后用毗邻的酯进行分子内环化,从而提供各自的吡咯并[3,4- d]吡嗪酮,在吡咯和/或哒嗪酮环上取代。所有转化均采用两步法一锅法进行,获得了一系列十个新化合物,收率为42–87%。