[NH:1]1[C:5]2=[N:6][CH:7]=[CH:8][CH:9]=[C:4]2[CH:3]=[CH:2]1.[N+:10]([O-])([OH:12])=[O:11].C(=O)(O)[O-].[Na+]>O>[N+:10]([C:3]1[C:4]2[C:5](=[N:6][CH:7]=[CH:8][CH:9]=2)[NH:1][CH:2]=1)([O-:12])=[O:11]3-nitro-7-azaindole 504 is prepared by adding 7-azaindole 1 to fuming nitric acid while cooling (e.g. 0° C.). After stirring for one to several hours, water is carefully added and the mixture neutralized with saturated sodium bicarbonate. The solids are collected by filtration and dried to provide 3-nitro-7-azaindole 504.
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