Multicomponent synthesis of pyridazine and pyridazinoquinazoline derivatives in the presence of catalysts such as magnesium oxide (MgO) and 12-tungstophosphoric acid (PW)
作者:Hassan Sheibani、Zeinab Esfandiarpoor
DOI:10.1002/jhet.355
日期:2011.9
series of 3‐amino‐2,5‐dihydropyridazines and fused pyridazinoquinazolines have been prepared in a one‐step procedure from three‐component reactions of (arylhydrazono)‐propan‐2‐ones, aldehydes and malononitrile or ethyl cyanoacetate in the presence of magnesiumoxide (MgO) and 12‐tungstophosphoric acid (PW) as highly effective heterogeneous catalysts. The salient features of these methods include high
Studies with enamines and azaenamines: A novel efficient route to 6-amino-1,4-dihydropyridazines and their condensed derivatives
作者:Said A. S. Ghozlan、Ismail A. Abdelhamid、Hamdi M. Hassaneen、Mohamed H. Elnagdi
DOI:10.1002/jhet.5570440118
日期:2007.1
1-Arylhydrazonopyruvaldehydes 1 react with α,β-unsaturated nitriles 2 to yield 6-amino-1,4-dihydropyridazines 4 that are converted into pyridazinones 5 via refluxing in an acetic acid/hydrochloric acid mixture and into the ethylidenemalononitrile derivatives 6 on reflux with malononitrile in ethanolic/piperidine solution.