[CH3:1][O:2][C:3]([C:5]1[S:6][C:7]2[CH:8](Br)[CH2:9][O:10][C:11]3[CH:18]=[CH:17][C:16]([Br:19])=[CH:15][C:12]=3[C:13]=2[N:14]=1)=[O:4].[N-:21]=[N+:22]=[N-:23].[Na+]>CO.O>[CH3:1][O:2][C:3]([C:5]1[S:6][C:7]2[CH:8]([N:21]=[N+:22]=[N-:23])[CH2:9][O:10][C:11]3[CH:18]=[CH:17][C:16]([Br:19])=[CH:15][C:12]=3[C:13]=2[N:14]=1)=[O:4]To a stirred mixture of 4,9-Dibromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (400 mg, 0.95 mmol) in MeOH (20 mL) was added a solution of NaN3 (93.1 mg, 1.43 mmol) in water (2 mL) dropwise at room temperature. The mixture was heated to 60° C. overnight. The mixture was cooled to room temperature, and then 20 mL of water was added. The mixture was stirred for 0.5 h and then filtered to afford 4-Azido-9-bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (400 mg, 28%). 1H NMR (400 MHz, DMSO-d6): δ 8.50 (d, J=2.5 Hz, 1H), 7.56 (dd, J=8.7 Hz, J2=2.6 Hz, 1H), 7.16 (d, J=8.6 Hz, 1H), 5.35 (m, 1H), 4.75 (m, 1H), 4.33 (m, 1H), 3.98 (s, 3H).
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