Cl[S:2]([OH:5])(=[O:4])=[O:3].[C:6]1([CH2:12][NH:13][CH2:14][CH2:15][OH:16])[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1>C(Cl)(Cl)(Cl)Cl.C(Cl)(Cl)Cl.C(O)C>[S:2]([OH:5])([O:16][CH2:15][CH2:14][NH:13][CH2:12][C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1)(=[O:4])=[O:3]Chlorosulfonic acid (13.3 mL, 0.2 mol) was added very slowly to (2-[(phenylmethyl)amino]ethanol (30.2 g, 0.2 mol) in carbon tetrachloride (100 mL) in an ice bath. The resulting thick white suspension was stirred at room temperature overnight The suspension was diluted with chloroform and ethanol, warmed to 45° C. and then cooled in an ice bath. The precipitate was collected by filtration, washed with ethanol and dried under vacuum for 16 hrs at 40° C. to afford the desired compound (34 g, 74%). MS (ES)+ m/z 232 [M+H]+.
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