[H-].[Na+].[CH3:3][S:4]([NH2:7])(=[O:6])=[O:5].[CH2:8]([O:10][C:11](=[O:19])[CH2:12][O:13][CH2:14][CH2:15][CH2:16][CH2:17]Br)[CH3:9].Cl>CN(C=O)C.O>[CH2:8]([O:10][C:11](=[O:19])[CH2:12][O:13][CH2:14][CH2:15][CH2:16][CH2:17][NH:7][S:4]([CH3:3])(=[O:6])=[O:5])[CH3:9]
To a mixture of NaH (60% in oil, 167 mg, 4.18 mmol) and DMF (10 mL) was added a solution of methanesulfonamide (398 mg, 4.18 mmol) in DMF (5 mL). The mixture was heated at 100° C. for 1.5 h and was cooled to room temperature. A solution of (4-bromo-butoxy)-acetic acid ethyl ester (1.000 g, 4.182 mmol) in DMF (10 mL) was added and the reaction was heated at 100° C. for 21 h. Water was added to the cooled reaction mixture and the aqueous solution was acidified to pH=2 with concentrated HCl. The aqueous solution was extracted with EtOAc (4×) and the organic solution was dried (MgSO4), filtered, and concentrated. The product was purified by flash chromatography (60% EtOAc/hexanes) to afford the title compound (181 mg). 1H NMR (400 MHz, CDCl3) δ 4.90 (m, 1H), 4.20 (q, 2H), 4.04 (s, 2H), 3.54 (m, 2H), 3.16 (m, 2H), 2.93 (s, 2H), 1.69 (m, 4H), 1.26 (t, 3H); MS 254.1 (M+1).
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