Cl[CH2:2][C:3]([C:5]1[CH:14]=[CH:13][C:8]2[NH:9][C:10](=[O:12])[S:11][C:7]=2[CH:6]=1)=[O:4].[N-:15]=[N+:16]=[N-:17].[Na+]>>[N:15]([CH2:2][C:3]([C:5]1[CH:14]=[CH:13][C:8]2[NH:9][C:10](=[O:12])[S:11][C:7]=2[CH:6]=1)=[O:4])=[N+:16]=[N-:17]Treatment of 6-(2-chloroethanoyl)-3H-benzothiazol-2-one with sodium azide, following the procedure described in Example 6, Step 4, gave 6-(2-azidoethanoyl)-3H-benzothiazol-2-one (6.95 g, 96%):
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