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Into a 1-L round-bottomed flask equipped with an addition funnel, a stirring bar and a nitrogen inlet, were added 40.2 g(0.23 mol) of benzenesulfonyl chloride, 150 mL of ether and 175 mL of a saturated aq. NaCl solution. The addition funnel was charged with a solution of 25.4 g (0.12 mol) of N-benzylbis(3-aminopropyl)amine and 175 mL of 1.3 N aq. NaOH. The amine was added dropwise with vigorous stirring over 2 h. The mixture was poured into a separatory funnel and the aqueous portion (bottom layer) removed. The two organic layers were diluted with 100 mL of chloroform and the resulting solution concentrated by rotary evaporation to a pale yellow oil. The residue was dissolved in 150 mL of dichloromethane. A solution of 2 N aq. HCl (60 mL) and 60 mL of saturated aq. NaCl was added and the mixture was stirred vigourously for 1 h. The layers were separated and the organic (lower) layer was washed with a saturated aq. NaCl solution (3×50 mL) and concentrated by rotary evaporation. The residue was recrystallized by bringing an ethanol solution of the residue to a boil and adding ethyl acetate to induce precipitation. The mixture was cooled to room temperature then to −25° C. for 2 weeks. Vacuum filtration of the precipitate gave 55.9 g (90%) of N-benzylbis(3-benzenesulfonamidopropyl)amine hydrochloride as a white solid. An analytical sample was prepared by drying at 65° C. (1 mm) for 13 h, mp 135-136° C. 1H NMR (DMSO-d6) δ11.0 (br, 1 H, BnNH), 7.89 (t, 2 H, J=5.7 Hz, SO2NH), 7.79 (d, 4 H, J=7.2 Hz,SO2ArH2,6), 7.59(m, 8 H. SO2ArH3,4,5, BnArH3,5), 7.41 (m, 3 H, BnArH2,4,6) 4.23 (d, 2 H, J=4.2 Hz, PhCH2N), 2.93 (m, 4 H, ArSO2NCH2CH2), 2.74 (m, 4 H, BnNCH2CH2), 1.88 (m, 4 H, NCH2CH2CH2N), 13C NMR (DMSO-d6) (140.3, 132.6, 131.5, 129.8, 129.6, 129.4, 128.9, 126.6, 56.0, 49.4, 40.1, 23.3. IR (KBr, cm−1) 3242 (br), 3073 (s), 2976 (m), 2855 (m), 2609 (s), 1470 (m), 1446 (s), 1330 (s), 1163 (s), 1092 (s), 740 (s), 689 (s). Anal. calc. for C25H31N3S2O4 HCl; C, 55.80; H, 5.99; N, 7.81; S, 11.92; Cl, 6.59. Found: C, 55.47; H, 6.13; N, 7.63; S, 11.63; Cl, 6.92%.

1. customInto a 1-L round-bottomed flask equipped with an addition funnel, a stirring bar and a nitrogen inlet
2. additionThe mixture was poured into a separatory funnel
3. customthe aqueous portion (bottom layer) removed
4. additionThe two organic layers were diluted with 100 mL of chloroform
5. concentrationthe resulting solution concentrated by rotary evaporation to a pale yellow oil
6. dissolutionThe residue was dissolved in 150 mL of dichloromethane
7. additionA solution of 2 N aq. HCl (60 mL) and 60 mL of saturated aq. NaCl was added
8. stirringthe mixture was stirred vigourously for 1 h
9. customThe layers were separated
10. washthe organic (lower) layer was washed with a saturated aq. NaCl solution (3×50 mL)
11. concentrationconcentrated by rotary evaporation
12. customThe residue was recrystallized
13. additionadding ethyl acetate
14. customprecipitation
15. waitto −25° C. for 2 weeks
16. filtrationVacuum filtration of the precipitate