[CH2:1]([NH:5][CH3:6])[CH2:2][CH2:3][CH3:4].[Cl:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][S:13](Cl)(=[O:15])=[O:14].C(N(CC)CC)C.Cl>C(Cl)Cl>[CH2:1]([N:5]([CH3:6])[S:13]([CH2:12][CH2:11][CH2:10][CH2:9][CH2:8][Cl:7])(=[O:15])=[O:14])[CH2:2][CH2:3][CH3:4]0.47 ml of N-butylmethylamine were added under an inert gas atmosphere to a solution of 410 mg of 5-chloropentane sulfonyl chloride in 10 ml of methylene chloride. The temperature rose from 13° C. to 26° C., and then after cooling to 0° to 5° C., 0.55 ml of triethylamine were added. The mixture was stirred at ambient temperature for 2 hours and the reaction medium was poured into an aqueous solution of 1M hydrochloric acid, extracted with methylene chloride, washed with water, then with a saturated aqueous solution of sodium chloride, dried and evaporated to dryness under reduced pressure to obtain 486 mg of the expected product.
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