[N-:1]=[N+:2]=[N-:3].[Na+].[S:5]([O:15][CH2:16][CH2:17][O:18][CH2:19][CH2:20]OS(C1C=CC(C)=CC=1)(=O)=O)([C:8]1[CH:14]=[CH:13][C:11]([CH3:12])=[CH:10][CH:9]=1)(=[O:7])=[O:6].O>CN(C=O)C>[C:11]1([CH3:12])[CH:10]=[CH:9][C:8]([S:5]([O:15][CH2:16][CH2:17][O:18][CH2:19][CH2:20][N:1]=[N+:2]=[N-:3])(=[O:6])=[O:7])=[CH:14][CH:13]=1Sodium azide (0.47 g, 7.24 mmol) added to a solution of diethyleneglycol ditosylate (3 g, 7.24 mmol) in DMF (30 mL) and the resulting mixture was heated to 110° C. for 5 hours. The reaction mixture was poured into chilled water (125 mL) and the product was extracted with ethyl acetate (3×100 mL), the collected organic extracts were washed with water (3×100 mL), brine and dried over MgSO4. The crude product was purified on SiO2 and DCM/MeOH 0-100% gradient as eluant to yield 0.34 g (16%) of 7 as a colorless oil. 1H NMR (400 MHz, CDCl3): δ 2.45 (s, 3H), 3.16 (t, J=4.8 Hz, 2H), 3.60 (t, J=4.8 Hz, 2H), 3.70 (t, J=4.8 Hz, 2H), 4.17 (t, J=4.8 Hz, 2H), 7.35 (d, J=8 Hz, 2H), 7.81 (d, J=8 Hz, 2H); 13C NMR (100.6 MHz, CDCl3): δ 21.6, 50.6, 68.7, 69.1, 70.2, 128.0, 129.9, 133.0, 144.9; MS ESI (m/z): [M+H]+ calcd. for C11H15N3O4S, 286.08. found 286.1
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