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12.5.6 Product Subclass 6: Aza Analogues of Pyrazolo[1,5-a]pyridines Containing Additional Nitrogen Atoms in the Six-Membered Ring

DOI: 10.1055/sos-SD-012-00784

Hajos, G.; Riedl, Z.Science of Synthesis, (200212667.

Derivatives of the four pyrazolodiazine ring systems pyrazolo[1,5-b]pyridazine (305), pyrazolo[1,5-c]pyrimidine (306), pyrazolo[1,5-a]pyrazine (307), and pyrazolo[1,5-a]pyrimidine (308), as well as some pyrazolotriazines, e.g. pyrazolo[1,5-b][1,2,4]triazine (309), pyrazolo[1,5-d][1,2,4]triazine (310), pyrazolo[1,5-a]-1,3,5-triazine (311), and pyrazolo[5,1-c][1,2,4]triazine (312), are discussed in this section (see Scheme 59).

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