[NH2:1][C:2]1[CH:11]=[C:10]2[C:5]([CH:6]=[CH:7][N:8]=[CH:9]2)=[CH:4][CH:3]=1.N([O-])=O.[Na+].O.[N-:17]=[N+:18]=[N-].[Na+]>C(O)(C(F)(F)F)=O>[N:1]([C:2]1[CH:11]=[C:10]2[C:5]([CH:6]=[CH:7][N:8]=[CH:9]2)=[CH:4][CH:3]=1)=[N+:17]=[N-:18]To a solution of 7-aminoisoquinoline (7.0 g) in TFA (35 mL) at 0° C. was added sodium nitrite (4.02 g) portionwise over a period of 30 minutes. The reaction was stirred at 0° C. to room temperature for 1.5 h. Water (3.5 mL) was added followed by portionwise addition of sodium azide (3.48 g) at 0° C. over a period of 30 minutes. After the addition, the reaction was slowly warmed up to room temperature and stirred for 1 h. Two third of TFA was evaporated and the residue was cooled to 0° C. Sodium bicarbonate (sat. in water) was added dropwisely to the residue until the pH was abouty 8-9. After extraction with methylene chloride (4×60 mL), the organic phase was combined, washed with water, brine, dried over sodium sulfate, filtered and concentrated to leave 7-azidoisoquinoline (7.5 g) as a dark brown solid. CI mass spectrum z (rel. intensity) 171 (M+H, 100).
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