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Search for "pyridazinium" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.
A simple, enaminone-based approach to some bicyclic pyridazinium tetrafluoroborates
Beilstein J. Org. Chem. 2013, 9, 1463–1471, doi:10.3762/bjoc.9.166
- Diffratometrica, Università di Ferrara, Via L. Borsari 46, 441 00, Ferrara, Italy 10.3762/bjoc.9.166 Abstract Easily obtainable cyclic enaminones (piperidin-2-ylidenealkanones) can be transformed into substituted bicyclic pyridazinium tetrafluoroborates upon treatment with corresponding diazonium salts. The
- transformation can be performed either in a one-pot way or in a two-step process with the isolation of single azo-coupled enaminone as the intermediate. The former method is superior. Under the optimized conditions, a number of pyridazinium salts substituted with both electron-donating and electron-withdrawing
- substituents was easily synthesized. A mechanism of the formation of the pyridazinium salts is suggested. A partial drawback is the possibility of the formation of a mixture of products when using a different diazonium salt in each step due to a reversibility of the azo coupling. This can be suppressed by
An expedient and new synthesis of pyrrolo[1,2-b]pyridazine derivatives
Beilstein J. Org. Chem. 2009, 5, No. 66, doi:10.3762/bjoc.5.66
- condensation reactions, such as the condensation of oxazolo[3,2-b]pyridazinium perchlorates with malononitrile, ethyl cyanoacetate and ethyl malonate in the presence of sodium ethoxide [15]; the condensation of 1,4,7-triketones with hydrazine followed by dehydrogenation [16]; the condensation of cyanoacetic
- cycloaddition of dimethyl acetylenedicarboxylate to the Reissert compound of pyridazine [20], the 1,3-dipolar cycloaddition of pyridazinium dichloromethylide generated by the carbene method [21], and the cycloaddition of alkylidene cyclopropane derivatives to pyridazine in the presence of Pd(PPh3)4 [22
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