[CH3:1][C:2]1[Se:6][C:5]([C:7]([O:9][CH3:10])=[O:8])=[CH:4][C:3]=1[N+:11]([O-])=O.CC1C([NH2:24])=C(C([O-])=O)[Se]C=1C.N([O-])=O.[Na+].C(=O)([O-])[O-].[K+].[K+].[CH3:35][NH:36][CH3:37]>[Fe]>[CH3:35][N:36]([N:24]=[N:11][C:3]1[CH:4]=[C:5]([C:7]([O:9][CH3:10])=[O:8])[Se:6][C:2]=1[CH3:1])[CH3:37]Nitration of methyl 5-methylselenophene-2-carboxylate provided methyl 5-methyl-4-nitroselenophene-2-carboxylate. The nitro functionality is reduced to amines using suitable reducing agents, for example, iron powder or any other nitro reducing agents in good yield. Diazotization of methyl-amino-5-methylselenophene-2-carboxylate with sodium nitrite followed by treatment with potassium carbonate/dimethylamine provides methyl 4-[(dimethylamino)diazenyl]-5-methylselenophene-2-carboxylate. Treatment of the ester with ammonia gave the required 4-[(dimethylamino)diazenyl]-5-methylselenophene-2-carboxamide (compound 1).
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