[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH2:14][CH:13]([S:16](Cl)(=[O:18])=[O:17])[CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:20][N:21]([CH3:25])[CH2:22][CH2:23][NH2:24].O>C(Cl)Cl>[CH3:20][N:21]([CH3:25])[CH2:22][CH2:23][NH:24][S:16]([CH:13]1[CH2:14][CH2:15][N:11]([C:9]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[O:10])[CH2:12]1)(=[O:18])=[O:17]A solution of 3-chlorosulfonyl-pyrrolidine-1-carboxylic acid benzyl ester (110 mg, 0.362 mmol) in CH2Cl2 (1.5 mL) was added to a solution of N,N-dimethylethylenediamine (0.20 mL, 1.83 mmol) in CH2Cl2 (1 mL) at 0° C. The mixture was stirred at 0° C. for 10 min, and then warmed to room temperature and stirred for 1 hr. Water was added and the phases were separated. The aqueous phase was extracted with CH2Cl2 (2×), the combined organic extracts were dried (Na2SO4), and the solvent was removed under vacuum to give benzyl 3-({[2-(dimethylamino)ethyl]amino}sulfonyl)-1-pyrrolidinecarboxylate (102 mg, 88%), which was used in the next step without further purification: 1H NMR (CDCl3) δ 7.36-7.29 (m, 5H), 5.14 (d, J=1.8 Hz, 2H), 3.80-3.72 (m, 4H), 3.50 (m, 1H), 3.16 (br s, 2H), 2.42 (t, J=5.7 Hz, 2H), 2.31 (m, 2H), 2.21 (s, 6H).
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