Sodium Dithionite → Pyrazolo[1,5-A]pyridine-2,3-diamine

Beteiligte Stoffe

Reaktionsschritte

2.66 g. 2-Aminopyrazolo[1,5-a]pyridine (see Chem. Pharm. Bull., 21, 2146/1973) are reacted with p-methoxybenzenediazonium salt analogously to Example 12.3.1, the resultant azo compound is reduced with sodium dithionite and the crude product obtained is purified to give 2,3-diaminopyrazolo[1,5-a]pyridine; m.p. 190° C.; Rf =0.6 (silica gel, ligroin/acetone/glacial acetic acid 60:40:1 v/v/v).

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