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4-Halo-177-pyrazolo pyridazines

Thus, the Richter reaction of the series of alkynylaminopyrazoles opens up a route to halo derivatives of l//-pyrazolo[3,4-c]pyridazines, 2//-pyrazolo[3,4-c] pyridazines, and lff-pyrazolo[4,3-c]pyridazines. [Pg.68]

The intramolecular cyclization of 2-alkynylaryldiazonium salts (Richter reaction) leads not only to 4-hydroxy- but also to 4-bromo- and 4-chlorocinnolines. The behavior of alkynylpyrazolediazonium chlorides differs from that of their benzene analogs. The Richter reaction of the series of alkynylaminopyrazoles gives only 4-halo derivatives of l//-pyrazolo[3,4-c]pyridazines and l//-pyrazolo[4,3-c] pyridazines, and mainly hydroxy derivatives of 2//-pyrazolo[3,4-c]pyridazines. [Pg.69]


See other pages where 4-Halo-177-pyrazolo pyridazines is mentioned: [Pg.46]   


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