[CH2:1]([O:3][CH2:4][CH2:5][NH2:6])[CH3:2].C(N(C(C)C)CC)(C)C.[CH:16]1[C:21]([S:22](Cl)(=[O:24])=[O:23])=[CH:20][CH:19]=[C:18]([I:26])[CH:17]=1>C(Cl)Cl>[CH2:1]([O:3][CH2:4][CH2:5][NH:6][S:22]([C:21]1[CH:16]=[CH:17][C:18]([I:26])=[CH:19][CH:20]=1)(=[O:24])=[O:23])[CH3:2]2-Ethoxyethylamine (2.14 g, 24 mmol) and diisopropylethylamine (4.2 ml, 24 mmol) were dissolved in DCM (50 ml) and cooled to 0° C. To this was added pipsyl chloride (6.05 g, 20 mmol) in portions and the reaction stirred for 18 hours. Volatiles were evaporated in vacuo. The residue was dissolved in EtOAc (50 ml), washed with 0.33M citric acid (2×50 ml), brine (50 ml), dried and evaporated in vacuo to yield an oil which solidified on standing to give the title compound as a pale yellow solid (6.97 g, 98%). NMR: 1.01 (t, 3H), 2.89 (q, 2H), 3.30 (m, 4H), 7.53 (d, 2H), 7.75 (t, 1H), 7.97 (d, 2H); m/z 354 (M−H)−.
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